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Instructions / Assembly

ManualsBrandsPYTHON ManualsBuilding materials65 sq. in. NFA Polypropylene Slant Back Roof Vent in Weatherwood (Carton of 6)
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The Python™ 65 Slant Back Vent Installation
Instructions
U.S. Pat. No. 8,181,403 & U.S. Pat. No. D629,093.
Quick Pre-Install Checklist
Contact your local code official before installing Python™ 65 Slant Back Vent for
compliance with local requirements.
Please see online Python™ Vent Calculator App at ___________, to determine how
much ventilation is required.
Install only one type of exhaust vent and remove and plug existing vents including
turbines, gable vents, roof louvers and static vents unless you are installing into existing
penetrations per the instructions.
The NFVA (Net Free Venting Area) of the eave/intake vents should never be less
than the NFVA of the 65 Slant Back Vents being installed. Improper balancing of the
system could result in weather infiltration and inadequate attic ventilation.
The Python™ 65 Slant Back Vent is engineered for use on roof pitches from 2/12 to
16/12.
Re-Roof and New Construction Installations
1. Locate the roof vents toward the rear or side of the house spaced evenly over the width
of the roof.
2. Mark the location of all roof vents before cutting holes. Center the holes between the
rafters down two feet (24″) from the peak of the roof.
3. Holes should be cut 11″ High x 10″ Wide. The Python™ 65 Slant Back Vent box has a
template for error proof installation. Using the template mark the outline for the hole
on the roof. The hole in the roof should never be larger than the hole at the bottom of
the vent.
4. Shingle up until shingles covers the bottom of the hole. Cut the excess shingles away.
Because shingles are part of a porous system applying an approved sealant around the
edge of the hole is required.
5. The top of the Python™ 65 Slant Back Vent has a slanted peak. Ensure that the vents are
installed with the peak at the UP position.
6. Secure the vent base with a minimum of 8 galvanized nails. Nails should be a minimum
of 1 1⁄4″ long and should penetrate the vent, shingle, and decking. Secure a nail in each
corner of the vent flashing and along the middle of each side of the vent.
7. For proper sealing use a plastic friendly roofing sealant. All nails to receive a dab of
sealant.
8. Shingle up and around the vent ensuring that the shingles butt up against the throat of
the vent.
9. Pre-cut the top shingle to fit around the slant of the vent and nail in place. Shingle up as
normal to complete installation.

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