UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual page 31


12" ( 305 m m ) Min. horizont al separat ion
bet ween com bust ion air int ake and vent of
sam e appliance.
 12" ( 305 m m ) Min. 84" ( 2.2 m ) Max. vert ical
separat ion bet ween com bust ion air int ake and
vent of different appliances.
 15" ( 381 m m ) Max. horizont al lengt h of vent .
Roof
 Min. vent/intake between different appliances
12" ( 305 m m ) .
Terminations
 Max. allowable t ot al vert ical vent lengt h wit h
out side exposure is 10 ft .( 3.05 m ) .
 Abandoned unused m asonry chim ney m ay be
used as chase- way for com bust ion air and
vent . Bot h com bust ion air and vent pipe m ust
exit above t op of chim ney wit h clearances as
shown in Figure 5- 14.
FI GURE 5 - 2 1 - Tw in Pipe on Roof Com bust ion Air On
Sidew a ll CAN BE U SED ON ALL SI Z ES
Vent Term inal
Com bust ion Air
Ground
Level
FI GURE 5 - 2 2 - Tw in Pipe Flue On Sidew a ll,
Com bust ion Air On Roof CAN BE U SED ON ALL SI Z ES
Com bust ion Air
Vent - T Term inal
12" ( 305 m m )
Ant icipat ed Snow Line
5 - COM BU STI ON AI R AN D V EN T PI PI N G
FI GURE 5 - 2 3 - ( 2 " / 6 0 m m & 3 " / 8 0 m m ) Tw in Pipe
Roof Vent CAN BE U SED ON ALL SI Z ES
This Termination
12" ( 305 m m ) Min.
can be used on:
2" / 60 mm ON
165/ 205
3" / 80 mm
ON ALL SIZES
vent only
Ve n t
12" ( 305 m m ) US,
18" ( 458 m m ) Canada
Min. Above
Ant icipat ed Snow Line
FI GURE 5 - 2 4 - ( 3 " / 8 0 m m ON LY) Single W a ll
Ex ha ust Kit a nd Air I nt a k e M inim um Dist a nce Cent er
t o Cent er
This Termination
can be used on:
3" / 80 mm
ALL SI ZES
vent pipe only
See Grade,
Snow & I ce
See page 23
FI GURE 5 - 2 5 - H orizont a l Tw in Pipe, Ex ha ust a nd
I nt a k e
This Termination
can be used on:
2" / 60 mm ON
Minim um Separat ion
165/ 205
3" / 80 mm
ON ALL SIZES
vent only
See Grade,
Snow & I ce
See page 23
2 7
15"
( 381 m m )
Max.
Roof Line
Com bu st ion
Air
Com bu st ion
Air
Ve n t
[ 120 m m ]
12" ( 305 m m )
Manufact urer
Recom m ends
Great er Separat ion
240013503 REV A, [ 03/ 15/ 2022]
43/4"