Figure 13 Minimum clearances from vent/air inlet terminations (see legend on adjacent page)
Description US Installations
1
1
Canadian
Installations
2
2
A Clearance above grade, veranda, porch, deck, or
balcony
1' (30 cm) 1' (30 cm)
B Clearance to window or door that may be opened 4' (1.2 m) below or to
side of opening
3' (91 cm)
C Clearance to permanently closed window
*
*
1
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2
In accordance with the current CAN/CSA-B149 Installation Codes.
*
Clearances in accordance with local installation codes and the requirements of the gas supplier.
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