MPH COLUMBIA BOILER COMPANY
13
REQUIRED BOILER MAKE-UP AIR
OPENING
SQUARE HOLE
ROUND PIPE
BTU INPUT
MIN. SQUARE
SQUARE HOLE
ROUND PIPE
INCHES
(APPROXIMATE)
(APPROXIMATE)
MPH 30
1,260,000
630
26 X 26
30
MPH 40
1,680,000
840
30 x 30
34
MPH 50
2,100,000
1050
34 X 34
38
MPH 60
2,520,000
1260
36 X 36
40
MPH 70
2,940,000
1470
40 x 40
42
MPH 80
3,360,000
1680
42 X 42
46
MPH 90
3,780,000
1890
44 X 44
50
MPH 100
4,200,000
2100
46 X 46
52
