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ILLUSTRATION OF MINIMUM CLEARANCES REQUIRING
ADDITIONAL RETURN AIR TO FURNACE
1 3/4" MAX
IF THE UNIT GRILLE IS FRAMED, FRAME MAY BE AT 0"
CLEARANCES TO TOP & SIDES OF GRILLE AND EXTEND
3
1
" MAX. FROM BACK SIDE OF GRILLE. THE
4
CLEARANCE MUST BE MAINTAINED FOR RETURN AIR
UNDER UNIT.
Suburban Division
TOP
VIEW
FURNACE
LEFT OR RIGHT SIDE
IS LESS THAN 8".
12 SQUARE INCHES OF ADDITIONAL
RETURN AIR IS REQUIRED IF LESS
THAN 8" TO SIDE WALL WITH 12"
FRONT WALL CLEARANCE MODEL NT-16SEQ
OR 18" FRONT WALL CLEARANCE MODEL NT-20SEQ.
Figure 9
Figure 10
6
FURNACE CABINET
WALL
12" NT-16SEQ
18" NT-20SEQ
/
" BOTTOM
1
4
1/4"
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