GAF Master flow Installation Instructions Download Page 1

Microwave & Range Hood Venting Kit

ROOF EXHAUST

Installation

Instructions

Follow the appliance manufacturer’s installation instructions when installing your appliance. Always comply with local  
building codes. Following these instructions, your range hood will vent directly out of the top of the unit.  Always use  
caution to avoid any wiring or plumbing when cutting into walls and ceiling. Always exercise caution and put safety first 
when working with metal ductwork and power tools; protect yourself by wearing safety goggles and gloves.

Step 6

Secure all connections with 
duct tape.

Install your goose neck vent 
(you may need to remove the 
elbow. Re-attach from below 
after proper vent installation.) 
With vent out of the hole,  
remove all nails within 4"  
of hole in all directions.  
Liberally coat underside of 
flashing with roofing cement. 
Carefully slide under upper 
shingles and position over hole.

Secure the vent with roofing 
nails at all corners. Also seal 
all flange and shingle edges, 
making sure all raised shingles 
have been thoroughly caulked 
and pressed back  into position.

Step 7

Step 1

Determine area to be  
removed from bottom  
of upper cabinet. Cut  
and remove.

Step 2

Step 3

Install appliance per the 

manufacturer’s installation

instructions. Put fan boot in 

place; and do not secure at  

this time.

Determine area to be removed 

from top of upper cabinet and 

ceiling. Always use caution to 

avoid wiring or plumbing when 

cutting into walls and ceilings. 

Cut and remove.

©2010 GAF Materials Corporation 3/10  #498, 1361 Alps Road, Wayne, NJ 07470

LL Building Products Inc.
Technical Support: 1-800-211-9612

Step 4

From the attic, use a plumb 
bob to determine the center
point of pipe on underside of
roof. Drill hole at center point.

Put an object through the hole
to mark it outside. Measure
and cut the opening.

Step 5

Click elbow into roof cap. 

Drop into opening. 

From inside attic, determine

length of 7" pipe (70" length 

of pipe is included–if more is 

needed, purchase separately) 

needed to complete run.  

Allow enough pipe for proper 

connection when marking 

pipe for cuts. Always cut pipe 

from non-crimped end.

Test fit all connections. Make

adjustments as needed.

NOTE: All installations are 
different. Additional parts may 
be needed to complete your 
installation.

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