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20 models · Specs last checked July 2, 2026

Which greenhouse ventilation should you actually buy?

With no preferences selected: AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed comes first in this spec comparison. None of these 20 has a verified Amazon listing yet, so this page ranks them on published specs only and has no Amazon buying links.

20 greenhouse ventilations compared.

No hands-on testingMethod and sources

The picks

Five options for different needs

Each option suits a different need. Bigger is useful only if it suits your setup.

Highest rank before your choices

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed

#1 of 20 in the spec comparison. 807 cfm airflow · joint 4th highest of 20 models; 78 W wattage · joint 15th lowest of 20 models.

Why consider it

  • 807 cfm airflow.
  • 78 W wattage.

Before you choose

For your setup, check airflow: 807 cfm.

Buy it ifYou want 807 cfm airflow.
Skip it ifYou need a different option for airflow; this model has 807 cfm.
Cfm: 807 cfmWattage: 78 WDuct Diameter Inches: 8 in
See all 9 scored specs
Cfm807 cfm
Wattage78 W
Duct Diameter Inches8 in
Noise39 dB
Speed Settings10
Controller IncludedIncluded
Dimensions Inches8.5x11.9x9.2
Mixed FlowIncluded
Pwm ControlIncluded

9 of 9 specs available · specs checked July 2, 2026 · Source ↗

No verified listing yet — check the maker's site for this model.

For Up to 388 cfm airflow

AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan

#3 of 20 in the spec comparison. 352 cfm airflow · 13th highest of 20 models; 35 W wattage · joint 6th lowest of 20 models.

Why consider it

  • 352 cfm airflow.
  • 35 W wattage.

Before you choose

For your setup, check airflow: 352 cfm.

Buy it ifYou want 352 cfm airflow.
Skip it ifYou need a different option for airflow; this model has 352 cfm.
Cfm: 352 cfmWattage: 35 WDuct Diameter Inches: 6 in
See all 9 scored specs
Cfm352 cfm
Wattage35 W
Duct Diameter Inches6 in
Noise34 dB
Speed Settings10
Controller IncludedIncluded
Dimensions Inches7.9x12.6x8.4
Mixed FlowIncluded
Pwm ControlIncluded

9 of 9 specs available · specs checked July 2, 2026 · Source ↗

No verified listing yet — check the maker's site for this model.

For Up to 6 in duct diameter

AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed

#2 of 20 in the spec comparison. 32 dB noise · joint 5th lowest of 15 models; 402 cfm airflow · joint 9th highest of 20 models.

Why consider it

  • 32 dB noise.
  • 402 cfm airflow.

Before you choose

For your setup, check airflow: 402 cfm.

Buy it ifYou want 32 dB noise.
Skip it ifYou need a different option for airflow; this model has 402 cfm.
Cfm: 402 cfmWattage: 38 WDuct Diameter Inches: 6 in
See all 9 scored specs
Cfm402 cfm
Wattage38 W
Duct Diameter Inches6 in
Noise32 dB
Speed Settings10
Controller IncludedIncluded
Dimensions Inches7.9x12.6x8.4
Mixed FlowIncluded
Pwm ControlIncluded

9 of 9 specs available · specs checked July 2, 2026 · Source ↗

No verified listing yet — check the maker's site for this model.

Also compare · AC Infinity CLOUDLINE S10 Quiet Inline Fan

AC Infinity CLOUDLINE S10 Quiet Inline Fan

#4 of 20 in the spec comparison. 1,201 cfm airflow · 2nd highest of 20 models; 136 W wattage · joint 17th lowest of 20 models.

Why consider it

  • 1,201 cfm airflow.
  • 136 W wattage.

Before you choose

For your setup, check wattage: 136 W.

Buy it ifYou want 1,201 cfm airflow.
Skip it ifYou need a different option for wattage; this model has 136 W.
Cfm: 1,201 cfmWattage: 136 WDuct Diameter Inches: 10 in
See all 9 scored specs
Cfm1,201 cfm
Wattage136 W
Duct Diameter Inches10 in
Noise48 dB
Speed Settings10
Controller IncludedIncluded
Dimensions Inches11.3x15.1x12.2
Mixed FlowIncluded
Pwm ControlIncluded

9 of 9 specs available · specs checked July 2, 2026 · Source ↗

No verified listing yet — check the maker's site for this model.

Also compare · Vivosun AeroZesh T6

Vivosun AeroZesh T6

#5 of 20 in the spec comparison. 408 cfm airflow · 8th highest of 20 models; 35 W wattage · joint 6th lowest of 20 models.

Why consider it

  • 408 cfm airflow.
  • 35 W wattage.

Before you choose

For your setup, check airflow: 408 cfm.

Buy it ifYou want 408 cfm airflow.
Skip it ifYou need a different option for airflow; this model has 408 cfm.
Cfm: 408 cfmWattage: 35 WDuct Diameter Inches: 6 in
See all 9 scored specs
Cfm408 cfm
Wattage35 W
Duct Diameter Inches6 in
Noise32 dB
Speed Settings10
Controller IncludedIncluded
Dimensions Inches12.4x8.0x8.7
Mixed FlowIncluded
Pwm ControlIncluded

9 of 9 specs available · specs checked July 2, 2026 · Source ↗

No verified listing yet — check the maker's site for this model.

Comparing AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed · AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed

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The facts that differ

Choose up to three. Facts stay neutral; your choices determine fit.

4 identical specs hidden. Non-applicable dimensions are omitted.

Published specification comparison
SpecAC Infinity CLOUDLINE S8 Quiet Inline Fan with SpeedNo preferences selected.AC Infinity CLOUDLINE S6 Quiet Inline Fan with SpeedNo preferences selected.
Cfm807 cfm402 cfm
Wattage78 W38 W
Duct Diameter Inches8 in6 in
Noise39 dB32 dB
Dimensions Inches8.5x11.9x9.27.9x12.6x8.4

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed

No preferences selected.

Cfm
807 cfm
Wattage
78 W
Duct Diameter Inches
8 in
Noise
39 dB
Dimensions Inches
8.5x11.9x9.2

AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed

No preferences selected.

Cfm
402 cfm
Wattage
38 W
Duct Diameter Inches
6 in
Noise
32 dB
Dimensions Inches
7.9x12.6x8.4

AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed

No verified listing yet.

AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed

No verified listing yet.

All 20 models, with reasons

— = no verified listing yet. The published order is independent of links.

All models and their decision specs
#ProductWhy it’s hereDecision specsCompareAction
1AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed405 cfm more airflow · 2 in more duct diameter vs #2.Cfm: 807 cfmWattage: 78 WDuct Diameter Inches: 8 in—
2AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed50 cfm more airflow · 2 dB less noise vs #3.Cfm: 402 cfmWattage: 38 WDuct Diameter Inches: 6 in—
3AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan101 W less wattage · 14 dB less noise vs #4.Cfm: 352 cfmWattage: 35 WDuct Diameter Inches: 6 in—
4AC Infinity CLOUDLINE S10 Quiet Inline Fan793 cfm more airflow · 4 in more duct diameter vs #5.Cfm: 1,201 cfmWattage: 136 WDuct Diameter Inches: 10 in—
5Vivosun AeroZesh T643 W less wattage · 7 dB less noise vs #6.Cfm: 408 cfmWattage: 35 WDuct Diameter Inches: 6 in—
6AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan602 cfm more airflow · 4 in more duct diameter vs #7.Cfm: 807 cfmWattage: 78 WDuct Diameter Inches: 8 in—
7AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed118 W less wattage · 34 dB less noise vs #8.Cfm: 205 cfmWattage: 21 WDuct Diameter Inches: 4 in—
#1 AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed
405 cfm more airflow · 2 in more duct diameter vs #2.
Cfm: 807 cfmWattage: 78 WDuct Diameter Inches: 8 in
—
#2 AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed
50 cfm more airflow · 2 dB less noise vs #3.
Cfm: 402 cfmWattage: 38 WDuct Diameter Inches: 6 in
—
#3 AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan
101 W less wattage · 14 dB less noise vs #4.
Cfm: 352 cfmWattage: 35 WDuct Diameter Inches: 6 in
—
#4 AC Infinity CLOUDLINE S10 Quiet Inline Fan
793 cfm more airflow · 4 in more duct diameter vs #5.
Cfm: 1,201 cfmWattage: 136 WDuct Diameter Inches: 10 in
—
#5 Vivosun AeroZesh T6
43 W less wattage · 7 dB less noise vs #6.
Cfm: 408 cfmWattage: 35 WDuct Diameter Inches: 6 in
—
#6 AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan
602 cfm more airflow · 4 in more duct diameter vs #7.
Cfm: 807 cfmWattage: 78 WDuct Diameter Inches: 8 in
—
#7 AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed
118 W less wattage · 34 dB less noise vs #8.
Cfm: 205 cfmWattage: 21 WDuct Diameter Inches: 4 in
—
20 matching models

How we rank and where the facts come from

We compare published specifications, not hands-on experience. Requirements filter the set; the sealed published order is unchanged. The index uses fixed weights and gives missing specs a midpoint. That is an assumption, not evidence of fit or quality. Unknown details cannot qualify a match.

What changed: specs in this snapshot were checked July 2, 2026. This package includes no prior spec revision; changes to individual values cannot be established.

Full methodologyReport a correction
Sources for all 20 models
  • AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE S10 Quiet Inline Fan: AC Infinity ↗ · July 2, 2026
  • Vivosun AeroZesh T6: Vivosun ↗ · July 2, 2026
  • AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE T12 Quiet Inline Duct Fan: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE A4 Quiet Inline Fan with Speed: AC Infinity ↗ · July 2, 2026
  • AC Infinity CLOUDLINE T6 Quiet Inline Duct Fan: AC Infinity ↗ · July 2, 2026
  • VEVOR 6" Inline Duct Fan with Temperature Humidity: VEVOR ↗ · July 2, 2026
  • Vivosun AeroZesh G6: Vivosun ↗ · July 2, 2026
  • AC Infinity CLOUDLINE T4 Quiet Inline Duct Fan: AC Infinity ↗ · July 2, 2026
  • iPower 4 Inch Inline Duct Fan with 10-Speed: Wayfair ↗ · July 2, 2026
  • TerraBloom 8" EC Inline Duct Fan with Variable Speed: TerraBloom ↗ · July 2, 2026
  • TerraBloom 6" EC Inline Duct Fan with Variable Speed: TerraBloom ↗ · July 2, 2026
  • TerraBloom 4" EC Inline Duct Fan with Variable Speed: TerraBloom ↗ · July 2, 2026
  • Can-Fan Max-Fan 6" 334 CFM Mixed Flow Inline Fan: Can-Filters ↗ · July 2, 2026
  • Can-Fan Max-Fan Pro Series 8": Can-Filters ↗ · July 2, 2026
  • Vortex Powerfan VTX600 6" Inline Fan: Hydrobuilder ↗ · July 2, 2026
Show the index and published weights

Weights: Cfm 16% · Wattage 14% · Duct Diameter Inches 13% · Noise 12% · Speed Settings 11% · Controller Included 10% · Dimensions Inches 9% · Mixed Flow 8% · Pwm Control 7%.

  1. AC Infinity CLOUDLINE S8 Quiet Inline Fan with Speed: 75/100
  2. AC Infinity CLOUDLINE S6 Quiet Inline Fan with Speed: 73/100
  3. AC Infinity CLOUDLINE A6 Quiet Inline Duct Fan: 72/100
  4. AC Infinity CLOUDLINE S10 Quiet Inline Fan: 71/100
  5. Vivosun AeroZesh T6: 71/100
  6. AC Infinity CLOUDLINE T8 Quiet Inline Duct Fan: 70/100
  7. AC Infinity CLOUDLINE S4 Quiet Inline Fan with Speed: 69/100
  8. AC Infinity CLOUDLINE T12 Quiet Inline Duct Fan: 68/100
  9. AC Infinity CLOUDLINE A4 Quiet Inline Fan with Speed: 68/100
  10. AC Infinity CLOUDLINE T6 Quiet Inline Duct Fan: 67/100
  11. VEVOR 6" Inline Duct Fan with Temperature Humidity: 65/100
  12. Vivosun AeroZesh G6: 65/100
  13. AC Infinity CLOUDLINE T4 Quiet Inline Duct Fan: 63/100
  14. iPower 4 Inch Inline Duct Fan with 10-Speed: 62/100
  15. TerraBloom 8" EC Inline Duct Fan with Variable Speed: 61/100
  16. TerraBloom 6" EC Inline Duct Fan with Variable Speed: 56/100
  17. TerraBloom 4" EC Inline Duct Fan with Variable Speed: 51/100
  18. Can-Fan Max-Fan 6" 334 CFM Mixed Flow Inline Fan: 50/100
  19. Can-Fan Max-Fan Pro Series 8": 45/100
  20. Vortex Powerfan VTX600 6" Inline Fan: 33/100

Before you buy

Why do some picks have no buy link?

Only exact models with verified Amazon listings receive links. Other models keep their place. A link does not establish current stock or price.

Does the highest rank mean the right product for me?

Start with your requirements, then compare the recorded differences. The published order reflects one set of weights, which may differ from your priorities.

What should I confirm before ordering?

Check the exact model, compatibility, current price and return terms. Published specs do not establish reliability, noise, comfort or ownership experience.