Several factors can affect the amount of attic ventilation a home needs. Variables such as vaulted ceilings, amount of existing venting (soffit, ridge, gable), attic shape, pitch and obstructions must all be taken into account when calculating the amount of attic venting needed. Your Natural Light dealer will determine the correct size unit or units needed for your specific installation. The output chart below reflects the average venting capacity and cfm output for each solar panel size available.
Solar Panel Size | Venting Capacity | CFM Output |
---|---|---|
32 Watt Model | up to 2,200 sf | up to 1,560 cfms |
35 Watt Model | up to 2,400 sf | up to 1,597 cfms |
48 Watt Model | up to 2,825 sf | up to 1,881 cfms |
65 Watt Model | up to 3,350 sf | up to 2,105 cfms |
CFM refers to cubic feet of air moved per minute. The higher the cfm number, the greater the capacity to move air.
16-watt roof-mounted solar attic fan installed on a steep roof of a cedar shingle home.
The charts below should be used as a general guideline for how many Solar Attic Fans are needed for residential installations based on square footage and roof pitch.
Download Solar Attic Fan Estimator Sheet pdf.
Attic Size | Attic Fans Needed |
---|---|
800 sf | (1) 32 watt OR (1) 35 watt |
1,260 sf | (1) 32 watt OR (1) 35 watt |
1,600 sf | (1) 32 watt OR (1) 35 watt |
2,100 sf | (1) 32 watt OR (1) 35 watt |
2,400 sf | (2) 32 watt OR (2) 35 watt OR (1) 48 watt |
3,000 sf | (2) 32 watt OR (2) 35 watt OR (1) 65 watt |
Attic Size | Attic Fans Needed |
---|---|
800 sf | (1) 32 watt OR (1) 35 watt |
1,260 sf | (1) 32 watt OR (1) 35 watt |
1,600 sf | (1) 32 watt OR (1) 35 watt |
2,100 sf | (2) 32 watt OR (2) 35 watt OR (1) 48 watt |
2,400 sf | (2) 32 watt OR (2) 35 watt OR (1) 48 watt |
3,000 sf | (2) 32 watt OR (2) 35 watt OR (1) 65 watt |
Attic Size | Attic Fans Needed |
---|---|
800 sf | (1) 32 watt OR (1) 35 watt |
1,260 sf | (1) 32 watt OR (1) 35 watt |
1,600 sf | (2) 32 watt OR (2) 35 watt OR (1) 48 watt |
2,100 sf | (2) 32 watt OR (2) 35 watt OR (1) 48 watt |
2,400 sf | (2) 48 watt OR (1) 65 watt |
3,000 sf | (3) 32 watt OR (3) 35 watt OR (2) 48 watt OR (1) 65 watt |