Instructions / Assembly
VentSure
™
Solar Attic Exhaust Fan—
Roof Mount Unit
Installation Instructions
Precautionary Notes
Safety Tips
• Complete all roof preparation prior to bringing the solar fan onto the roof.
• Keep the solar panel covered until after installation. Exposing the solar panel to the
sun will start the fan blades rotating which could cause bodily injury.
Roof Deck
• Maximum 6" width
25
⁄32" minimum thickness of wood sheathing
• Minimum
3
⁄8" plywood sheathing or
7
⁄16" OSB
• Sheathing spaced minimum
1
⁄8" and maximum ¼"
• Check local building codes or use decking recommended by American Plywood
Association
Ventilation Requirements
• Ventilation must meet or exceed Federal Housing Administration minimum
property standard.
• Before beginning the installation, calculate the square feet of attic space being
ventilated and select the recommended number of VentSure Solar Attic Exhaust
Fans necessary for moving the required CFM (cubic feet per minute). Depending
on the size of attic space to be ventilated, more than 1 solar fan may be required.
See Fan Sizing Chart below.
• It is critical to ensure there is proper intake ventilation at the
eave or fascia. For each Roof Mount fan, Owens Corning
requires 600 sq. in. of intake.
Note: If it isn’t practical to achieve the required amount of intake
ventilation, Owens Corning recommends adequately sealing the attic
oor and any HVAC ducts in the attic to prevent pulling air from
conditioned space.
• Some attics have more than one walled off or chambered area.
This situation will require fans for each area.
• To maximize the solar fan’s effectiveness you should remove or
block any rooftop static vents, gable end vents, or ridge vents.
This can be accomplished using any roo ng underlayment,
ensuring it is securely attached. (Figures 2 and 3)
Positioning
• The solar fan should be positioned to face south or southwest
for optimum performance and should be positioned on an
area of the roof that is not shaded or blocked from the sun for
extended periods throughout the day.
• The solar fan should be installed 18-24" from the ridge of the
roof and as close to mid-point of the house as possible. (Figure 4)
• In the event 2 or more fans are being installed, separate the
fans by at least 15 feet to optimize ventilation.
Fan Sizing Chart
Attic Size
(Sq. Ft.)
Number of Roof Mount Fans Required
Low Slope 3:12–4:12 Medium Slope 5:12–8:12 Steep Slope 9:12–12:12
1,200 1 1 1
1,600 1 1 2
2,000 1 1 2
2,400 1 2 2
2,800 1 2 3
This fan is designed for new or re-
roo ng work over any properly built
and supported wood roof deck having
adequate nail holding capacity, a smooth
surface, and a roof slope of 4:12 or greater.
Before installing this product, check
local building codes for their roo ng
requirements.
The manufacturer will not be responsible
for problems resulting from any deviation
from the recommended application
instructions.
TOOLS REQUIRED
• Ladder
• Reciprocating saw or jig saw
• Power drill with a ½"–1" drill bit
(only one needed)
• Hammer and roo ng nail
• Caulk Gun with ASTM D 4586 Type I
Asphalt Roo ng Cement
• Measuring tape or ruler
• Permanent marker, sidewalk chalk
or colored pencil
• Roo ng knife or box cutter
• Flat pry bar
• Phillips Screwdriver
Box Contents
Figure 3
Figure 2
south or southwest
mid-day summer sun
Figure 4
Solar Attic Fan
(not pictured)
A
Attic-mounted
Controller
Module
B
4 - Mounting
Screws
C
2 - 8' Cables
D
AC Power
Adapter
A
B
C
D
Figure 1