Pad-and-Fan Cooling
Evaporative cooling pads cool greenhouse intake air as water evaporates across a corrugated cellulose or similar media wall. Used with exhaust fans, they form a pad-and-fan system that cuts peak summer temperatures without mechanical refrigeration.
How it works in a greenhouse
- Exhaust fans pull outside air through a wetted corrugated pad wall.
- As water evaporates, the temperature of the air entering the crop zone drops.
- Pad face area and thickness are matched to fan capacity and local wet-bulb conditions.
Applications
- Opposite the exhaust-fan wall in commercial and research greenhouses.
- Hot, dry or moderately humid climates where evaporative cooling is effective.
- Retrofits and new builds that need pads sized with matching exhaust fans.
Selection notes
- Send greenhouse dimensions, fan plan (if any) and water quality notes.
- We suggest pad thickness and face area for your climate and static-pressure budget.
- Pads can be quoted alone or with matched exhaust and circulation fans.
Related resources
How Exhaust Fans Work
Greenhouse Air Circulation
Greenhouse Evaporative Cooling Pads
Frequently asked questions
How do evaporative cooling pads work in a greenhouse?
Exhaust fans pull outside air through a wetted pad wall. As water evaporates, the air temperature drops before it enters the crop zone. Effectiveness depends on outdoor wet-bulb temperature, pad thickness and face velocity.
What pad thickness should I choose?
Common greenhouse pads are about 100–150 mm thick. Thicker pads add contact time and cooling when face velocity is controlled. We confirm thickness after reviewing your climate data and fan capacity.
Do pads need a water treatment system?
Hard or high-mineral water can scale pads quickly. Many projects add filtration or treatment. Tell us your water source when requesting a quote so we can flag maintenance needs.