W415-1013 / C / 11.19.13
43
EN
Using a manometer with appropriate scale range connect testing tube between manometer and chimney
connector. End of testing tube should be inserted in chimney connector so approximately 1” (25mm) of tube
protrudes into and perpendicular to exhaust stream. This measurement shall be taken approximately 12”
(305mm) above elbow/T attached to the furnace
fl
ue. Any hole made in the chimney connector for insertion of
manometer tube shall be adequately sealed with high temp materials when testing is complete.
6.4.2 MEASURING DRAFT
H3.58
CHIMNEY DRAFT GREATER THAN -0.06" W.C. (-15 Pa) MAY CAUSE AN UNCONTROLLABLE FIRE
AND DAMAGE THE FURNACE.
IMPORTANT:
○
The warm air supply duct system shall be constructed of metal in accordance with NFPA 90B, 2-1.1.
○
The plenums installed to the furnace shall be constructed of metal in accordance with NFPA 90B, 2-1.3.
6.5
CONNECTING DUCTWORK/PLENUMS BETWEEN “ADD ON” FURNACE AND
ORIGINAL FURNACE
