Master Flow® offers a complete line of quality choices. In fact, we’re so confident in the performance of our louvers that we offer a four-year ltd. warranty!

When you compare our features and warranty to any other brand on the market, Master Flow® louvers are the obvious choice!

<< Back to Attic Ventilation

SSB960A

Our Best Metal Roof Louver with fully enclosed hood to help prevent rodent/insect infiltration and leaf/pine needle clogging

  • Slant-Back Design For Superior Performance...
    Best choice against weather infiltration, especially in steep-slope applications
     
  • 20% More Ventilating Capacity *...
    A full 60 sq. in. of net free ventilating area (NFA) per vent
     
  • Lower Installation Costs...
    Fewer vents needed for roof installation*
     
  • Looks Better...
    Embossed finish hides scratches, resists wear
     
  • Popular Colors...
    To complement most roofs (Black, Brown, Weathered Wood, White, Mill, Shingle Match™ Weathered Wood)
     
  • Professional’s Choice...
    12% larger flashing with pre-drilled nail holes makes installation easier, helps prevent leaks
     
  • Longer Lasting...
    Aluminum construction won’t rust

*Compared to 50 sq. in. NFA vents

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of
SSB960 Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000

4
240
1001-1500
6
360
1501-2000
8
480
2001-2500
10
600
2501-3000
12
720

Approval #
05-0909.02

Texas Department of Insurance Product Evaluation RV-38

IR65

Our Best High-Impact Resin Roof Louver with superior resistance against dents and scratches

  • Slant-Back Design For Superior Performance...
    Best choice against weather infiltration, especially in steep-slope applications
     
  • High Impact Resin Construction...
    With UV inhibitors to maintain consistent color
     
  • 30% More Ventilating Capacity*...
    A full 65 sq. in. of net free ventilating area (NFA) per vent
     
  • Less Hassles...
    Scratch, crush, and dent resistant
     
  • Lower Installation Costs...
    Fewer vents needed for roof installation*        
     
  • 4 Popular Colors...
    To complement most roofs (Black, Brown, Gray, Weathered Wood)
     
  • Professional’s Choice...
    12% larger flashing with pre-drilled nail holes make installation easier, helps prevent leaks
     
  • Unique, Built-In Screen...
    Helps deter bird and rodent infiltration; prevents clogging from leaves and pine needles
     
  • Hood Stays In Place...
    Hood is securely snapped in place (rather than tacked) to reduce chance of blow-off

*Compared to 50 sq. in. NFA vents

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of IR65 Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000
4
260
1001-1500
6
390
1501-2000
8
520
2001-2500
10
650
2501-3000
12
780
   

RT-65

Square-Top Resin Construction

  • Large Capacity...
    Full 60 sq. in. of net free ventilating area (NFA) per vent
     
  • Less Hassles...
    Scratch, crush and dent resistant
     
  • 4 Popular Colors...
    To complement most roofs (Black, Brown, Gray, Weathered Wood)
     
  • Easier To Install...
    Pre-drilled nail holes with extra wide flashing area
     
  • Homeowner’s Choice...
    High-impact resin construction looks great for years

*Compared to 50 sq. in. NFA vents

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of RT-65 Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000
4
240
1001-1500
6
360
1501-2000
8
480
2001-2500
10
600
2501-3000
12
720
   

IR-61

Super-Low Profile, Slant-Back Resin Construction

  • Sleek Design...
    Super-low profile (just 2" high!) for better appearance
     
  • Homeowner’s Choice...
    High-impact resin construction looks great for years
     
  • 4 Popular Colors...
    To complement most roofs (Black, Brown, Gray, Weathered Wood)
     
  • Easier To Install...
    Pre-drilled nail holes make installation easier

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of IR-61 Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000
7
259
1001-1500
10
370
1501-2000
13
481
2001-2500
17
629
2501-3000
20
740

NSB50A

Square-Top Slant-Back Metal Vent

  • Large Capacity...
    Full 50 sq. in. of net free ventilating area (NFA) per vent
     
  • Long Lasting...
    Aluminum construction resists rust (available in galvanized construction by special order only)
     
  • Popular Colors...
    See chart below

Approval # NOA 02-0524.02

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of NSB50A Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000
5
250
1001-1500
8
400
1501-2000
10
500
2001-2500
12
600
2501-3000
15
750

RV50A/R50A*

Square-Top Metal Utility Vent

  • Perfect Utility Vent...
    Recommended for kitchen duct outlets and bathroom fan exhausts, as well as attic ventilation
     
  • Large Capacity...
    Full 50 sq. in. of net free ventilating area (NFA) per vent
     
  • Versatile...
    Available with square (R50A) or round (RV50A) throat, in heavy duty aluminum
     
  • Easier To Install...
    Pre-drilled nail holes with extra wide flashing area
     
  • Popular Colors...
    See chart below

*R50A is CSA approved

 

 
How Many Do I Need?
Total
Attic Square
Footage
Recommended Number of RV50A/R50A Louvers
Minimum Intake Ventilation (Net Free Area In Sq. In.)
0-1000
5
250
1001-1500
8
400
1501-2000
10
500
2001-2500
12
600
2501-3000
15
750
   

 

<< Back to Attic Ventilation