YardVerdict participates in Amazon Associates and may earn from qualifying purchases when eligible links are added.

Best Greenhouse Ventilation of July 2026

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed Controller leads 20 greenhouse ventilation at 75/100, 2 points ahead of AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed Controller. Its strongest results are speed settings (10, 100/100) and controller included (Yes, 100/100). The weakest high-weight line is cfm at 46/100 (807). AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan with Speed Controller is #3 at 72/100, leaving a 3-point spread across the top 3.

Updated July 2, 2026 from published manufacturer specs. Scored by the YardVerdict methodology · Editorial standards

SPEC LEDGER#1

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed Controller

Greenhouse Ventilations

Duct Diameter Inches8

Cfm807

Wattage78

Controller IncludedYes

YardVerdict75/100

4 specs · 1 source

Full scorecard ->

How scoring works

Cfm16%

Wattage14%

Duct Diameter Inches13%

Noise12%

Speed Settings11%

Controller Included10%

Dimensions Inches9%

Mixed Flow8%

Pwm Control7%

Scored from published specs · method

Quick picks

Where should you start?

#1Best Overall75/100
AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed
cfm drawback, 46/100
Scorecard
#2#2 Overall73/100
AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed
18/100 drawback: cfm
Scorecard
#3#3 Overall72/100
AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan
14/100 drawback: cfm
Scorecard
#4#4 Overall71/100
AC Infinity CLOUDLINE S10 Quiet Inline Fan
Compromise: wattage (30/100)
Scorecard

How to choose

How do the weights fit your use?

Shoppers who care about buyers comparing cfm from published manufacturer or retailer specs should anchor on cfm and ignore everything below it at first. Shoppers who instead need buyers comparing wattage from published manufacturer or retailer specs get more signal from wattage than from the raw rank. Either way, duct diameter inches is a detail-panel check, not a reason to reopen the shortlist.

Use-case comparison

Before the Table: Greenhouse Ventilations Fit Checks

Two greenhouse ventilations rows can post the same overall score for different reasons — one on cfm, the other on wattage. Check which one before assuming the tie is real. This table's cfm data was last confirmed July 2, 2026; older or unconfirmed figures are not carried forward as current. A tie on the surface is rarely a tie underneath: two greenhouse ventilations rows can land on the same score while one wins on cfm and the other on wattage. Open both rows before treating either greenhouse ventilations pick as interchangeable with the other.

All 20 greenhouse ventilations, ranked

Every greenhouse ventilations row here can be compared on cfm, wattage, and duct diameter inches without opening a drawer; other fields are one click further in.

YardVerdict charts 8 scored dimensions across all 20 greenhouse ventilations. Among the greenhouse ventilations, cfm shows the widest spread in the full catalog range.

Showing all 20 scored products.

No greenhouse ventilations row is hidden from this 2026 table — all 20 are shown, sourced from published manufacturer and retailer spec tables; marketing claims are not scored unless the source hierarchy backs the field, with duct diameter inches, cfm, wattage beside each score.
Product					Best fit / trade-off	Action
Top scoreAC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed	75/100	8	807	78	Best With Controller IncludedTrade-off: Cfm 46/100	Full scorecard
AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed	73/100	6	402	38	Trade-off: Cfm 18/100	Full scorecard
AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan	72/100	6	352	35	Trade-off: Cfm 14/100	Full scorecard
AC Infinity CLOUDLINE S10 Quiet Inline Fan	71/100	10	1,201	136	Trade-off: Wattage 30/100	Full scorecard
Vivosun AeroZesh T6	71/100	6	408	35	Trade-off: Cfm 18/100	Full scorecard
AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan	70/100	8	807	78	Trade-off: Cfm 46/100	Full scorecard
AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed	69/100	4	205	21	Trade-off: Duct Diameter Inches 0/100	Full scorecard
AC Infinity CLOUDLINE T12 Quiet Inline Duct Fan	68/100	12	1,604	139	Trade-off: Noise 0/100
AC Infinity CLOUDLINE A4 Quiet Inline Fan with Speed	68/100	4	165	18	Trade-off: Duct Diameter Inches 0/100
AC Infinity CLOUDLINE T6 Quiet Inline Duct Fan	67/100	6	402	38	Trade-off: Cfm 18/100
VEVOR 6" Inline Duct Fan with Temperature Humidity	65/100	6	402	38	Trade-off: Cfm 18/100
Vivosun AeroZesh G6	65/100	6	388	35	Trade-off: Cfm 17/100
AC Infinity CLOUDLINE T4 Quiet Inline Duct Fan	63/100	4	205	21	Trade-off: Duct Diameter Inches 0/100
iPower 4 Inch Inline Duct Fan with 10-Speed	62/100	4	214	30	Trade-off: Duct Diameter Inches 0/100
TerraBloom 8" EC Inline Duct Fan with Variable Speed	61/100	8	569	74	Trade-off: Cfm 29/100
TerraBloom 6" EC Inline Duct Fan with Variable Speed	56/100	6	288	36	Trade-off: Cfm 10/100
TerraBloom 4" EC Inline Duct Fan with Variable Speed	51/100	4	141	21	Trade-off: Cfm 0/100
Can-Fan Max-Fan 6" 334 CFM Mixed Flow Inline Fan	50/100	6	334	75	Trade-off: Speed Settings 0/100
Can-Fan Max-Fan Pro Series 8"	45/100	8	863	186	Trade-off: Wattage 0/100
Vortex Powerfan VTX600 6" Inline Fan	33/100	6	497	136	Trade-off: Controller Included 0/100

#1
Rank #1AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed
75/100
Duct Diameter Inches
8
Cfm
807
Wattage
78
Best With Controller Included
Trade-off: Cfm 46/100
Full scorecard
#2
AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed
73/100
Duct Diameter Inches
6
Cfm
402
Wattage
38
Trade-off: Cfm 18/100
Full scorecard
#3
AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan
72/100
Duct Diameter Inches
6
Cfm
352
Wattage
35
Trade-off: Cfm 14/100
Full scorecard
#4
AC Infinity CLOUDLINE S10 Quiet Inline Fan
71/100
Duct Diameter Inches
10
Cfm
1,201
Wattage
136
Trade-off: Wattage 30/100
Full scorecard
#5
Vivosun AeroZesh T6
71/100
Duct Diameter Inches
6
Cfm
408
Wattage
35
Trade-off: Cfm 18/100
Full scorecard
#6
AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan
70/100
Duct Diameter Inches
8
Cfm
807
Wattage
78
Trade-off: Cfm 46/100
Full scorecard
#7
AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed
69/100
Duct Diameter Inches
4
Cfm
205
Wattage
21
Trade-off: Duct Diameter Inches 0/100
Full scorecard
#8
AC Infinity CLOUDLINE T12 Quiet Inline Duct Fan
68/100
Duct Diameter Inches
12
Cfm
1,604
Wattage
139
Trade-off: Noise 0/100
#9
AC Infinity CLOUDLINE A4 Quiet Inline Fan with Speed
68/100
Duct Diameter Inches
4
Cfm
165
Wattage
18
Trade-off: Duct Diameter Inches 0/100
#10
AC Infinity CLOUDLINE T6 Quiet Inline Duct Fan
67/100
Duct Diameter Inches
6
Cfm
402
Wattage
38
Trade-off: Cfm 18/100
#11
VEVOR 6" Inline Duct Fan with Temperature Humidity
65/100
Duct Diameter Inches
6
Cfm
402
Wattage
38
Trade-off: Cfm 18/100
#12
Vivosun AeroZesh G6
65/100
Duct Diameter Inches
6
Cfm
388
Wattage
35
Trade-off: Cfm 17/100
#13
AC Infinity CLOUDLINE T4 Quiet Inline Duct Fan
63/100
Duct Diameter Inches
4
Cfm
205
Wattage
21
Trade-off: Duct Diameter Inches 0/100
#14
iPower 4 Inch Inline Duct Fan with 10-Speed
62/100
Duct Diameter Inches
4
Cfm
214
Wattage
30
Trade-off: Duct Diameter Inches 0/100
#15
TerraBloom 8" EC Inline Duct Fan with Variable Speed
61/100
Duct Diameter Inches
8
Cfm
569
Wattage
74
Trade-off: Cfm 29/100
#16
TerraBloom 6" EC Inline Duct Fan with Variable Speed
56/100
Duct Diameter Inches
6
Cfm
288
Wattage
36
Trade-off: Cfm 10/100
#17
TerraBloom 4" EC Inline Duct Fan with Variable Speed
51/100
Duct Diameter Inches
4
Cfm
141
Wattage
21
Trade-off: Cfm 0/100
#18
Can-Fan Max-Fan 6" 334 CFM Mixed Flow Inline Fan
50/100
Duct Diameter Inches
6
Cfm
334
Wattage
75
Trade-off: Speed Settings 0/100
#19
Can-Fan Max-Fan Pro Series 8"
45/100
Duct Diameter Inches
8
Cfm
863
Wattage
186
Trade-off: Wattage 0/100
#20
Vortex Powerfan VTX600 6" Inline Fan
33/100
Duct Diameter Inches
6
Cfm
497
Wattage
136
Trade-off: Controller Included 0/100

Close greenhouse ventilations scores within 2 points use the published tie-break rules; the table still shows duct diameter inches and cfm for context.

All 20 scored products are included in the table.

Source fields checked on July 2, 2026. The greenhouse ventilations table includes duct diameter inches, cfm, and wattage so the lowest dimension is visible; price and availability fields require sourced records. No product is a perfect match; low scores mark the closest match only when a row misses a scored dimension.

Product Finder

Greenhouse Airflow Sizing Tool

Shopper enters greenhouse floor area in square feet, power access (solar-only vs electrical outlet available), and primary goal (automatic temperature-triggered venting vs continuous air circulation). The tool computes a Required Airflow figure from floor area and greenhouse height, compares it against each product's rated CFM or lift force, and flags automatic vent openers whose trigger temperature range or lift capacity is undersized for the stated roof vent weight. Output ranks options by airflow-to-size fit and power source match.

Every score sits on a 0-100 scale built from published specifications, with greenhouse ventilations: cfm and wattage leading the visible weights.

Duct Diameter Inches6

Filter by duct diameter inches.

Cfm402

Filter by cfm.

Wattage38

Filter by wattage.

More matching details1 more

Controller Included

Requires controller included.

FILTER THE TABLE

Set greenhouse ventilations preferences around cfm to narrow the ranking below. Until then, every scored row stays visible in the default order.

YardVerdict maps 20 greenhouse ventilations by cfm and wattage. Lead marker score: 75/100 with wattage plotted.

How does each pick stack up?

#1 AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed75/100Speed Settings 11 pts, Controller Included 10 pts, Wattage 9 pts
#2 AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed73/100Wattage 12 pts, Speed Settings 11 pts, Noise 11 pts
#3 AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan72/100Wattage 13 pts, Speed Settings 11 pts, Controller Included 10 pts
#4 AC Infinity CLOUDLINE S10 Quiet Inline Fan71/100Cfm 12 pts, Speed Settings 11 pts, Controller Included 10 pts
#5 Vivosun AeroZesh T671/100Wattage 13 pts, Speed Settings 11 pts, Noise 11 pts

5 products with score contribution by dimension
Product	Composite	Cfm	Wattage	Duct Diameter Inches	Noise	Speed Settings	Controller Included	Dimensions Inches	Mixed Flow	Pwm Control
AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed	75/100	7.3 points from grade 0.46	9 points from grade 0.64	6.5 points from grade 0.5	8.1 points from grade 0.68	11 points from grade 1	10 points from grade 1	8.5 points from grade 0.94	8 points from grade 1	7 points from grade 1
AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed	73/100	2.9 points from grade 0.18	12.3 points from grade 0.88	3.3 points from grade 0.25	10.6 points from grade 0.88	11 points from grade 1	10 points from grade 1	7.9 points from grade 0.88	8 points from grade 1	7 points from grade 1
AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan	72/100	2.3 points from grade 0.14	12.6 points from grade 0.9	3.3 points from grade 0.25	9.9 points from grade 0.82	11 points from grade 1	10 points from grade 1	7.9 points from grade 0.88	8 points from grade 1	7 points from grade 1
AC Infinity CLOUDLINE S10 Quiet Inline Fan	71/100	11.6 points from grade 0.72	4.2 points from grade 0.3	9.8 points from grade 0.75	4.9 points from grade 0.41	11 points from grade 1	10 points from grade 1	4.5 points from grade 0.5	8 points from grade 1	7 points from grade 1
Vivosun AeroZesh T6	71/100	2.9 points from grade 0.18	12.6 points from grade 0.9	3.3 points from grade 0.25	10.6 points from grade 0.88	11 points from grade 1	10 points from grade 1	5.3 points from grade 0.59	8 points from grade 1	7 points from grade 1

The top five greenhouse ventilations are separated by 4 points; cfm is the tiebreaker.

Best Overall

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed

75/100

YardVerdicthow it’s scored

Duct Diameter Inches: 8
Cfm: 807
Wattage: 78
Controller Included: Yes

Showing all 9 scored dimensions

Cfm46

Wattage64

Duct Diameter Inches50

Noise68

Speed Settings100

Controller Included100

Dimensions Inches94

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed shows a 50/100 soft spot on duct diameter inches. AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed beats AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed on CFM: 46/100 vs 18/100. AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed leads its own scorecard on speed settings, a 100/100 result from 807 CFM.

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed stays close to AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed with only 2 points between them, so cfm then wattage is the first place to look for a practical difference.

Noise: AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed scores 68/100 on noise, which carries 12% of the score; helping AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed reach 75/100 for buyers comparing noise db from published manufacturer or retailer specs.
Speed Settings: AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed scores 100/100 on speed settings, which carries 11% of the score; one reason AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed stands out for buyers comparing speed settings from published manufacturer or retailer specs.
Controller Included: A controller-included listing for AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed reaches the ceiling for this dimension; a visible edge for AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed for buyers comparing controller included from published manufacturer or retailer specs.

Check before you buy

For the CLOUDLINE S8 Quiet Inline Fan with Speed Controller, the published record is weakest on cfm at 807 (46/100), the line to weigh before buying.
AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed shows a listed CFM of 807 as its 46/100 soft mark for buyers comparing cfm from published manufacturer or retailer specs.

Details ▾

Display model: CLOUDLINE S8
Duct Diameter Inches: 8
Cfm: 807
Wattage: 78
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#2 Overall

AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed

73/100

YardVerdicthow it’s scored

Duct Diameter Inches: 6
Cfm: 402
Wattage: 38
Controller Included: Yes

Showing all 9 scored dimensions

Cfm18

Wattage88

Duct Diameter Inches25

Noise88

Speed Settings100

Controller Included100

Dimensions Inches88

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed leads noise here, 88/100 to AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan's 82/100; the AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed row lists 402 CFM. It scores 25/100 on duct diameter inches. AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed has the stronger CFM score, 46/100 to AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed's 18/100.

On cfm, the shortlist barely separates AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed from AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed; weigh cfm against wattage for your own use before treating AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed as clearly better.

Wattage: A listed wattage of 38 for AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed keeps this dimension in the upper range; useful support for buyers comparing AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed for buyers comparing wattage from published manufacturer or retailer specs.
Noise: AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed scores 88/100 on noise, which carries 12% of the score; one reason AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed stands out for buyers comparing noise db from published manufacturer or retailer specs.
Speed Settings: AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed scores 100/100 on speed settings, which carries 11% of the score; a visible edge for AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed for buyers comparing speed settings from published manufacturer or retailer specs.

Check before you buy

For the CLOUDLINE S6 Quiet Inline Fan with Speed Controller, the published record is weakest on cfm at 402 (18/100), the line to weigh before buying.
AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed should be rechecked on cfm; a listed CFM of 402 keeps that line at 18/100.

Details ▾

Display model: CLOUDLINE S6
Duct Diameter Inches: 6
Cfm: 402
Wattage: 38
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#3 Overall

AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan

72/100

YardVerdicthow it’s scored

Duct Diameter Inches: 6
Cfm: 352
Wattage: 35
Controller Included: Yes

Showing all 9 scored dimensions

Cfm14

Wattage90

Duct Diameter Inches25

Noise82

Speed Settings100

Controller Included100

Dimensions Inches88

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan pulls ahead on wattage: 90/100, past AC Infinity CLOUDLINE S10 Quiet Inline Fan at 30/100. AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan, at 14/100, gives ground on CFM. AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan concedes noise to AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed, 82/100 versus 88/100.

AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan is essentially in the same cfm tier as AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed; wattage matters more here than the list order.

Wattage: A listed wattage of 35 for AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan holds a high mark on this input; helping AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan reach 72/100 for buyers comparing wattage from published manufacturer or retailer specs.
Noise: AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan scores 82/100 on noise, which carries 12% of the score; a visible edge for AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan for buyers comparing noise db from published manufacturer or retailer specs.
Speed Settings: AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan scores 100/100 on speed settings, which carries 11% of the score; useful support for buyers comparing AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan for buyers comparing speed settings from published manufacturer or retailer specs.

Check before you buy

For the CLOUDLINE A6 Quiet Inline Duct Fan with Speed Controller, the published record is weakest on cfm at 352 (14/100), the line to weigh before buying.
AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan should be rechecked on cfm; a listed CFM of 352 keeps that line at 14/100.

Details ▾

Display model: CLOUDLINE A6
Duct Diameter Inches: 6
Cfm: 352
Wattage: 35
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#4 Overall

AC Infinity CLOUDLINE S10 Quiet Inline Fan

71/100

YardVerdicthow it’s scored

Duct Diameter Inches: 10
Cfm: 1,201
Wattage: 136
Controller Included: Yes

Showing all 9 scored dimensions

Cfm72

Wattage30

Duct Diameter Inches75

Noise41

Speed Settings100

Controller Included100

Dimensions Inches50

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE S10 Quiet Inline Fan makes the most sense for its 100/100 on made for buyers who put cfm (1,201) first. AC Infinity CLOUDLINE S10 Quiet Inline Fan slips on wattage, 30/100 next to AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan's 90/100. It outscores Vivosun AeroZesh T6 on CFM, 72/100 over 18/100.

AC Infinity CLOUDLINE S10 Quiet Inline Fan and AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan are separated by 1 point; compare cfm and wattage before choosing between them.

Cfm: A listed CFM of 1,201 for AC Infinity CLOUDLINE S10 Quiet Inline Fan keeps this dimension out of the weak band; helping AC Infinity CLOUDLINE S10 Quiet Inline Fan reach 71/100 for buyers comparing cfm from published manufacturer or retailer specs.
Duct Diameter Inches: A listed duct diameter inches of 10 for AC Infinity CLOUDLINE S10 Quiet Inline Fan stays above the field midpoint; a visible edge for AC Infinity CLOUDLINE S10 Quiet Inline Fan for buyers comparing duct diameter inches from published manufacturer or retailer specs.
Speed Settings: AC Infinity CLOUDLINE S10 Quiet Inline Fan scores 100/100 on speed settings, which carries 11% of the score; helping AC Infinity CLOUDLINE S10 Quiet Inline Fan reach 71/100 for buyers comparing speed settings from published manufacturer or retailer specs.

Check before you buy

The score gives up the most ground on wattage (136).
AC Infinity CLOUDLINE S10 Quiet Inline Fan loses ground on wattage: a listed wattage of 136 sits at 30/100.

Details ▾

Display model: CLOUDLINE S10
Duct Diameter Inches: 10
Cfm: 1,201
Wattage: 136
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#5 Overall

Vivosun AeroZesh T6

71/100

YardVerdicthow it’s scored

Duct Diameter Inches: 6
Cfm: 408
Wattage: 35
Controller Included: Yes

Showing all 9 scored dimensions

Cfm18

Wattage90

Duct Diameter Inches25

Noise88

Speed Settings100

Controller Included100

Dimensions Inches59

Mixed Flow100

Pwm Control100

Why it ranks here

Vivosun AeroZesh T6 scores 100/100 on speed settings, above AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan's 50/100, with 408 CFM on Vivosun AeroZesh T6. It is one to double-check on duct diameter inches, at 25/100. AC Infinity CLOUDLINE S10 Quiet Inline Fan edges Vivosun AeroZesh T6 on CFM: 72/100 vs 18/100.

Vivosun AeroZesh T6 stays close to AC Infinity CLOUDLINE S10 Quiet Inline Fan on total score, so cfm then wattage is the first place to look for a practical difference.

Wattage: A listed wattage of 35 for Vivosun AeroZesh T6 scores strongly on this line; a visible edge for Vivosun AeroZesh T6 for buyers comparing wattage from published manufacturer or retailer specs.
Noise: Vivosun AeroZesh T6 scores 88/100 on noise, which carries 12% of the score; helping Vivosun AeroZesh T6 reach 71/100 for buyers comparing noise db from published manufacturer or retailer specs.
Speed Settings: Vivosun AeroZesh T6 scores 100/100 on speed settings, which carries 11% of the score; one reason Vivosun AeroZesh T6 stands out for buyers comparing speed settings from published manufacturer or retailer specs.

Check before you buy

Vivosun AeroZesh T6 carries a listed CFM of 408 as a 18/100 trade-off for buyers comparing cfm from published manufacturer or retailer specs.
Vivosun AeroZesh T6 loses ground on duct diameter inches: a listed duct diameter inches of 6 sits at 25/100.

Details ▾

Display model: AeroZesh T6
Duct Diameter Inches: 6
Cfm: 408
Wattage: 35
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#6 Overall

AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan

70/100

YardVerdicthow it’s scored

Duct Diameter Inches: 8
Cfm: 807
Wattage: 78
Controller Included: Yes

Showing all 9 scored dimensions

Cfm46

Wattage64

Duct Diameter Inches50

Noise68

Speed Settings50

Controller Included100

Dimensions Inches94

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan wins the CFM comparison, 46/100 against AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed's 4/100. It gives up speed settings to Vivosun AeroZesh T6, 50/100 under 100/100. duct diameter inches is where AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan slips, to 50/100.

On cfm, the shortlist barely separates AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan from Vivosun AeroZesh T6; weigh cfm against wattage for your own use before treating AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan as clearly better.

Noise: AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan scores 68/100 on noise, which carries 12% of the score; one reason AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan stands out for buyers comparing noise db from published manufacturer or retailer specs.
Controller Included: A controller-included listing for AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan reaches the ceiling for this dimension; useful support for buyers comparing AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan for buyers comparing controller included from published manufacturer or retailer specs.
Dimensions Inches: AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan scores 94/100 on dimensions inches, which carries 9% of the score; helping AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan reach 70/100 for buyers comparing dimensions inches from published manufacturer or retailer specs.

Check before you buy

Its lowest-scoring line in the listing is cfm (807).
AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan lands a listed CFM of 807 where cfm is scored, its lowest visible line.

Details ▾

Display model: CLOUDLINE T8
Duct Diameter Inches: 8
Cfm: 807
Wattage: 78
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

#7 Overall

AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed

69/100

YardVerdicthow it’s scored

Duct Diameter Inches: 4
Cfm: 205
Wattage: 21
Controller Included: Yes

Showing all 9 scored dimensions

Cfm4

Wattage98

Duct Diameter Inches0

Noise100

Speed Settings100

Controller Included100

Dimensions Inches71

Mixed Flow100

Pwm Control100

Why it ranks here

AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed is the row to shortlist given its 100/100 on choose it for cfm (205). AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed comes out ahead on noise: 100/100 to AC Infinity CLOUDLINE T12 Quiet Inline Duct Fan's 0/100, with 205 CFM on AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed. AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed trails on CFM here, 4/100 to AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan's 46/100.

AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed is essentially in the same cfm tier as AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan; wattage matters more here than the list order.

Wattage: A listed wattage of 21 for AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed takes full credit for this dimension; helping AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed reach 69/100 for buyers comparing wattage from published manufacturer or retailer specs.
Noise: AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed scores 100/100 on noise, which carries 12% of the score; a visible edge for AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed for buyers comparing noise db from published manufacturer or retailer specs.
Speed Settings: AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed scores 100/100 on speed settings, which carries 11% of the score; useful support for buyers comparing AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed for buyers comparing speed settings from published manufacturer or retailer specs.

Check before you buy

The listed specs are thinnest on duct diameter inches (4).
AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed lands a listed duct diameter inches of 4 where duct diameter inches is scored, its lowest visible line.

Details ▾

Display model: CLOUDLINE S4
Duct Diameter Inches: 4
Cfm: 205
Wattage: 21
Controller Included: Yes
Last verified: 2026-07-02

Compare all 20 ↑Specs checked July 2, 2026

How this ranking is scored

Each product in this table gets one 0–100 score computed from manufacturer sheets, retailer listings, and dated source records: the same weighted formula for all 20 greenhouse ventilations, applied to 9 recorded fields per product. The four heaviest dimensions and their exact share of the total are shown here; the full weight table, source ledger, and score-band definitions live on the methodology page.

YardVerdict does not conduct first-hand product tests. Scores synthesize published manufacturer and retailer records only, and every figure traces to a dated source. Marketing claims and retailer copy are excluded unless a published specification supports them.

Full methodology →

Heaviest scoring dimensions
Cfm	16%	Listed cfm runs from 141 to 1,604 across the scored catalog; higher numbers score better, and unlisted values score neutral.
Wattage	14%	The scored range for listed wattage spans 18 to 186; lower numbers score better, with missing values held neutral.
Duct Diameter Inches	13%	Across the catalog, listed duct diameter inches goes from 4 to 12; higher numbers score better, while a missing entry stays neutral.
Noise	12%	Listed noise runs from 28 dB to 62 dB across the scored catalog; lower numbers score better, and unlisted values score neutral.

Score bands80+ strong60–79 solidBelow 60 limited fit

Retrieved 2026-07-02 · Built 2026-07-10

AC Infinity2026-07-02Source record
Can-Filters2026-07-02Source record
Hydrobuilder2026-07-02Source record
Scored product catalog2026-07-02Source record
TerraBloom2026-07-02Source record

YardVerdict source ledger tracks greenhouse ventilations with 8 retrieval records, retrieved 2026-07-02.

Update history

July 2, 2026Rankings rebuilt from the refreshed catalog: 20 greenhouse ventilations re-scored on 9 published spec fields, cfm first.

Common buying questions

What is the best greenhouse ventilation?

The leading greenhouse ventilation on cfm is AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed, 75/100 — but cfm at 46/100 is the visible trade-off.

How should I compare close alternatives?

For near-tied greenhouse ventilations, compare the published specs that carry the decision: cfm, each product's lowest-scoring dimension, and wattage. Close alternatives can reorder after cfm changes, so fixed role labels stay out of the answer. The 0-100 scale is the same for every greenhouse ventilation scored here, and cfm and wattage set most of the spread.

Are these greenhouse ventilation rankings based on physical testing?

Published-spec scorecard, not testing. Read the cfm and wattage result as a research aid to this greenhouse ventilation ranking, then verify fit and current availability before buying. The greenhouse ventilation weight table shows how much cfm and wattage matter to the total.