
Green Attic 40W Solar Attic Fan (Model SFM-F40A)
SFM-F40A Product Specs

Designed for Roof-Mounted Solar Ventilation
The SFM-F40A is built with an adjustable solar panel, low-profile roof housing, protective screen and mounting hardware that help the installer position the fan for roof conditions and sun exposure.
Adjustable Roof Angle
The solar panel angle can be set to match the roof slope and improve sun exposure after installation.
Manual Panel Adjustment
The frame can be adjusted by hand during setup so the installer can fine-tune the panel angle without complicated hardware.
Low-Profile Roof Design
The unit sits close to the roof surface for a cleaner appearance while still supporting attic air movement.
Roof-Mounted Ventilation Design
The fan body is built for roof placement with a base and hood designed to move attic air out through the roof assembly.
Integrated Protective Screen
The protective screen helps keep debris away from the fan opening while allowing attic air to move through the unit.
Adjustable Mounting Bracket
The mounting bracket supports panel positioning during installation and helps match the fan setup to roof conditions and sun exposure.
What’s Included with the SFM-F40A Install
The customer is buying a productized installation package: the fan, placement, roof work, inspection, system test, and Green Attic warranty support.
Attic inspection
We check air sealing, insulation depth, intake vents, baffles, moisture indicators, roof condition, and fan sizing before recommending the product.
Roof placement
We review sun exposure, pitch, access, roof surface, and existing ventilation before placing the fan.
Standard installation
Includes roof cut-in, flashing, sealing, fan setup, and operational testing for the standard package.
Warranty support
Green Attic’s 10-year fan component warranty is confirmed in the written estimate.
Is the SFM-F40A Right for Your Attic?
A solar attic fan is only recommended when the attic has the right conditions. If not, we tell you what to fix first.
Air-sealed attic floor
Helps prevent the fan from pulling conditioned air from the living space.
Proper insulation depth
Supports attic performance so the fan is not compensating for insulation gaps.
Clear soffit intake + baffles
Balanced intake gives the fan the right air source and reduces negative pressure risk.

Frequently Asked Question
How much does it cost to install a solar attic fan in Chicago and the North Suburbs?
The 24V backup power option typically costs around $950 installed, when applicable. Final pricing and scope are confirmed in your written estimate after Green Attic inspects the attic and roof.
Do solar attic fans work at night?
For heavily shaded roofs or homes with high humidity loads, Green Attic may recommend a low-voltage 24V backup power option. This uses a small transformer connected to the home’s existing power, with built-in temperature and humidity sensors that trigger backup operation only when attic conditions cross set thresholds.
How noisy is the Green Attic 40W solar attic fan?
Actual noise depends on installation location, roof structure, attic layout, and whether the fan is properly mounted. Green Attic checks the attic and roof setup before installation so the fan is placed and installed correctly.
Does a solar attic fan require a permit or electrician?
If your home needs the optional low-voltage 24V backup power option, the requirements may be different. The backup option depends on site conditions and installation scope, and final pricing is confirmed in your written estimate.
Can a solar attic fan help reduce my cooling costs?
Because the standard fan runs on built-in solar power, it does not add fan operating cost to your electric bill during solar operation. Actual savings depend on your home, roof exposure, HVAC system, thermostat habits, insulation level, and attic ventilation.

