Page 135 - PMAA Catalogue Final

AIR FLOW CALCULATOR

EXAMPLE 1: PMA 4220
Minimum Distance Across Louvre (A = 29mm)
Divided by Pitch (B = 55mm)
Multiplied by 100
PMA 4220 Divided by 1
( 29 ÷ 55 ) x 100 ÷ 1 = 52.73%
(53%) Air Flow - Approximate.

= 29mm
Across Louvre
(A) Minimum Distance

(B) 55mm Pitch PMA 4220

External

PMA 3114 (A) Minimum Distance

= 57mm
Across Louvre

(B) 100mm Pitch PMA 3114

EXAMPLE 2: PMA 3114
Minimum Distance Across Louvre (A) = 57mm
Divided by Pitch (B) = 100mm
Multiplied by 100
Divided by 1
( 57 ÷ 100 ) x 100 ÷ 1
External = 57% Air Flow - Approximate.

*NOTE: DRAWINGS ARE NOT TO SCALE LOUVRE BLADES 134