Product Brochure
18
Roof & Gable Wall Louvers
• Large Capacity... Full 60 sq. in. of net free ventilating area (NFA) 
per vent
• Less Hassles... Scratch, crush, and dent resistant
• Easy to Install... Pre-drilled nail holes with extra-wide 
flashing area
• Homeowner’s Choice... High-impact plastic resin construction 
looks great for years
• UV Inhibitors... Help to maintain consistent color
• Four Popular Colors... To complement most roofs (Black, Brown, 
Gray, Weathered Wood)
RT65
Square-Top Plastic Roof Louver
Texas Department 
of Insurance
Product Evaluation RV-61
IR61
Slant-Back Plastic Roof Louver
• Sleek Design... Low profile for better appearance 
• Good Ventilator... Full 37 sq. in. of net free ventilating area 
(NFA) per vent
• Homeowner’s Choice... High-impact plastic resin construction 
looks great for years
• Easy to Install... 
Pre-drilled nail holes 
make installation easier
• UV Inhibitors... Help to 
maintain consistent color
• Four Popular Colors... To complement 
most roofs (Black, Brown, Gray, 
Weathered Wood)
Texas Department of 
Insurance Evaluation 
RV-61
Gable Wall Louvers
Intake / Exhaust  Ventilation
Aluminum & Plastic  
DA & SL Series
• Aluminum Gable Wall Louvers... Available in painted white 
or unfinished metal (DA Series)
• Thermoformed Plastic Gable Wall Louvers... 
One-piece inte-
gral louvered construction provides exceptional strength and 
eliminates the need for a screen (SL Series)
•  Sleek Design... For flush or recessed installation!
Thermoformed plastic construction shownAluminum construction shown
For use in intake or exhaust applications, Master Flow
®
 offers a 
line of versatile plastic and aluminum gable louvers, as well as 
the perfect solution for hard-to-ventilate or restricted areas — 
our circular louvers. (See page 19 for sizes and specications)
Plastic Circular Louvers 
RLSC Series
• Easy to Install... Just cut appropriate-sized hole and snap 
in place!
• One-Piece Design... White, 
high-impact plastic construction for 
long life
• Durable... Contains UV inhibitors 
for long-lasting durability
• Versatile... Available in 
2", 3", or 4" sizes
Recommended for hard-to-ventilate or other restricted areas 
(Aluminum only)










