Exhaust Fans in Greenhouse Climate Control
In a ClimaSpan climate control layout, greenhouse exhaust fans create negative pressure that pulls hot, humid air out so cooler outdoor air can enter through side vents or an evaporative cooling-pad wall. Fan type and count are sized from greenhouse dimensions and air-exchange goals, then quoted by project. See the product page for the full equipment overview.
Equipment selection and scope are confirmed in a written quote after we review your greenhouse size, layout, crop and climate. We do not publish public prices or catalogue-only spec sheets on these pages.
Role in the climate system
- Wall-mounted exhaust fans pull warm, humid air out of the greenhouse.
- Negative pressure draws cooler outdoor air in through side vents or a cooling-pad wall.
- Used with evaporative pads, this forms a classic pad-and-fan cooling layout for hot weather.
- Controllers can stage fans by temperature or humidity when automation is included.
Selection points
- Share greenhouse length, width, eave height and location.
- Describe crop type, peak summer goals and whether you already have pads or vents.
- Summer pad-and-fan or tunnel-style layouts often target about 45–60 air changes per hour — we confirm the target for your crop and climate in the quote process.
- Exact models and airflow are confirmed only in a written quote.
How it pairs with structure and crops
- Fits film, glass and polycarbonate greenhouses — single-span or multi-span.
- Pads belong on the opposite end when you want evaporative intake cooling.
- Circulation fans remix air inside; they do not replace exhaust capacity.
- Product details: see the greenhouse exhaust fans page.
Related greenhouse systems
Exhaust Fans product page
Full greenhouse exhaust fan overview.
Cooling Pads (system)
Pad wall matched to exhaust.
Circulation Fans (system)
In-house mixing.
Climate Control hub
Full climate package.
Frequently asked questions
What size exhaust fan do I need for my greenhouse?
Size depends on floor area, eave height, crop heat load and local design temperature. Summer pad-and-fan or tunnel layouts often target about 45–60 air changes per hour. Send length, width, height and location to [email protected] for a model recommendation.
How is an exhaust fan different from a circulation fan?
Exhaust fans remove air from the greenhouse and create negative pressure. Circulation fans move air inside the house to even out temperature and humidity. Most commercial greenhouses need both.
Can ClimaSpan supply a full pad-and-fan package?
Yes. We supply matched exhaust fans, evaporative cooling pads and circulation fans for greenhouse projects and can quote them as one climate package.
Where is the product page?
Open the greenhouse exhaust fans product page for the equipment-focused overview, then return here for the climate-system context.