RSI Greenhouse Exhaust Fan System
Price range: $524.99 through $994.97
Features
- Supports better climate control during warmer weather with fast, active ventilation
- Moves 1,250 CFM — enough to exchange the air in most small to mid-size greenhouses in minutes
- Best paired with an intake shutter vent to pull fresh air across the structure as warm air is exhausted
- Optional thermostat lets the system respond automatically based on the temperature you set
- Direct-drive motor is fully enclosed and maintenance-free
- Made in the USA
What's Included
Exhaust fan:
- Exhaust fan unit (16″) with built-in shutter
- Mounting hardware not included — fasteners vary by wall material and structure
Optional intake vent (if selected):
- 18″ louver vent
- Auto opener
Optional thermostat (if selected):
- Single-stage thermostat
Dimensions
Exhaust fan — rough opening required:
- Outside mount: 17″ x 17″
- Inside mount: 16 1/4″ x 16 1/4″
Intake louver vent (if selected):
- 18″ W x 18″ L x 4″ D
Compatability
- Compatible with any greenhouse
- Originally designed for MONT greenhouses
Not sure if this fan is the right size for your space? Use our CFM calculator to find out.
Secure Checkout
Nationwide Delivery
Veteran-Owned
Real Greenhouse Owners
Personalized Planning Help
Description
The RSI Greenhouse Exhaust Fan System is one of the most effective upgrades you can make for temperature and air quality inside your greenhouse. Instead of relying on passive ventilation through roof vents and doors, an exhaust fan actively pulls hot air out — lowering temperatures faster, reducing humidity, and keeping air moving through the growing space. Better airflow means plants stay under less heat stress, and for crops that benefit from pollination, the movement helps there too.
The RSI exhaust fan moves 1,250 CFM and runs on a standard 110V outlet. The motor is fully enclosed and direct-drive, so there’s nothing to lubricate or service. For the system to work well, placement matters: mount the exhaust fan high on one wall where heat collects, and place the intake vent lower on the opposite wall so cooler air is drawn across the full length of the greenhouse. If you’re using automatic roof vents alongside the fan, it’s worth disengaging them so the fan pulls air through the intended intake rather than the nearest opening.
The optional intake vent is an 18″ louver made from extruded aluminum. It opens and closes automatically based on inside temperature — no electricity or batteries needed. When closed, the overlapping slats block insects from entering, and cleanup is as simple as wiping it down.
Add the optional thermostat to make the whole system fully hands-off. It kicks the fan on when your set temperature is reached and shuts it off once things cool back down — so your greenhouse stays in range even when you’re not around.
The fan can be mounted from the outside or inside depending on your setup. Either way, you’ll need to cut a rough opening in the wall. Mounting hardware is not included, as the right fasteners will depend on your wall material and framing.
Not sure which size you need? Use our CFM calculator to find the right fan for your greenhouse.
Where should I install the fan and the intake vent?
Mount the exhaust fan high on one side of the greenhouse, where heat naturally collects. Place the intake vent lower on the opposite end of the greenhouse so cooler outside air gets pulled across the length of the greenhouse before exiting.
Should I disable my automatic roof vents when using the exhaust fan?
Yes, if this is your main active ventilation setup. If the roof vents are open, the fan will pull air through the closest opening rather than drawing it across the full length of the greenhouse, which reduces how effective the system is.
Do I need the thermostat?
You don’t have to have it, but it makes the system a lot more hands-off. Without it, you control the fan and intake manually. With it, the intake vent opens and the fan kicks on automatically when the temperature inside reaches the level you set.
Can this fan be installed in any greenhouse?
Yes — it’s not brand-specific and can be fitted into any greenhouse. You’ll need to cut an opening in the wall panel to mount it, so make sure you select the right size for your structure before installing.
If you have a glass greenhouse, tempered glass can’t be cut safely, so a Lexan panel (or similar material) can be used in its place — you’d remove the glass panel, cut the Lexan to fit, and install the fan or intake through that.
Reviews
Related products
-
Drop Door Kit for Nelke Pro Greenhouses
$1,099.00 Add to cart -
MONT Foldable Work Station Kit
Price range: $429.99 through $759.99 Select options This product has multiple variants. The options may be chosen on the product page -
Janssens Louver Window
Price range: $524.00 through $643.00 Select options This product has multiple variants. The options may be chosen on the product page -
Janssens Low Threshold Kit for Sliding Doors
$199.00 Select options This product has multiple variants. The options may be chosen on the product page