TR Series
7
Figure 3a.
Appliances located in confined spaces. Air from
inside the building. See Table 2 (2.3).
Figure 3b.
Appliances located in confined spaces. Air from out-
doors. See Table 2 (2.4).
Figure 3c.
Appliances located in confined spaces. Air from out-
doors through ventilated attic. See Table 2 (2.4).
Figure 3d.
Appliances located in confined spaces. All air from
outdoors through ventilated crawl space and outlet
air to ventilated attic. See Table 2 (2.4).
305 mm
(12 in.)
max
.
CHIMNEY
OPENINGS
127 mm
(5 in.)
max.
305 mm
(12 in.) max.
152 mm
(6 in.) max
.
BOILER
BOILER
BOILER
BOILER
CHIMNEY
CHIMNEY
VENTILATION LOUVERS
(EACH END OF ATTIC)
INLET AIR DUCT
(ENDS 305 mm
(1 FT.) ABOVE
FLOOR.)
OUTLET
AIR
CHIMNEY
VENTILATION LOUVERS
(EACH END OF ATTIC.)
OUTLET
AIR
INLET AIR
VENTILATION LOUVERS
FOR UNHEATED CRAWL SPACE
OUTLET AIR DUCT
INLET AIR DUCT