Venting Capacity
NATURAL LIGHT SOLAR ATTIC FANS PROVIDE
Superior Air Movement
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 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 1,599 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.
Average Venting Area
Natural Light manufactures 4 different watt sized models for roof, curb, gable or remote mounting options.
32
WATT
vents up to
2,200 sf
35
WATT
vents up to
2,400 sf
48
WATT
vents up to
2,825 sf
65
WATT
vents up to
3,350 sf
Solar Attic Fan Estimator Chart
The chart below should be used as a general guideline for how many Natural Light Solar Attic Fans are needed for residential installations based on square footage and roof pitch.
 |
 |
 |
|
| ROOF PITCH | up to 4:12 | up to 8:12 | up to 12:12 |
| 800 SF Attic Size | (1) 32 Watt | (1) 32 Watt |
(1) 32 Watt OR
(1) 35 Watt |
| 1,260 SF Attic Size | (1) 32 Watt | (1) 32 Watt OR
(1) 35 Watt |
(1) 32 Watt OR
(1) 35 Watt |
| 1,600 SF Attic Size | (1) 32 Watt OR
(1) 35 Watt |
(1) 32 Watt OR
(1) 35 Watt |
(2) 32 Watt OR
(2) 35 Watt OR (1) 48 Watt |
| 2,100 SF Attic Size | (1) 32 Watt OR
(1) 35 Watt |
(2) 32 Watt OR
(2) 35 Watt OR (1) 48 Watt |
(2) 32 Watt OR
(2) 35 Watt OR (1) 48 Watt |
| 2,400 SF Attic Size | (2) 32 Watt OR
(2) 35 Watt OR (1) 48 Watt |
(2) 32 Watt OR
(2) 35 Watt OR (1) 48 Watt |
(2) 48 Watt OR
(1) 65 Watt |
| 3,000 SF Attic Size | (2) 32 Watt OR
(2) 35 Watt OR (1) 65 Watt |
(2) 32 Watt OR
(2) 35 Watt OR (1) 65 Watt |
(3) 32 Watt OR
(2) 48 Watt OR (1) 65 Watt |
Natural Light Solar Attic Fan Unit Estimator
Several factors can affect the amount of attic ventilation a home needs including the amount of existing venting and attic shape. To assist calculating the amount of fans needed, download our quick reference estimator chart.