QHT Boiler - Manual (Page 4)

4
Restrictor Sizing Chart
Exterior Vent Warnings
Vent Type Length (ft) Restrictor Size
1.65 to 3.3 41
3.3 to 8.8 44
8.8 to 32.8 None
1.65 (in) and 1.65 (out) 38
3.3 to 39.40 (tot. in + out) 41
39.40 to 131 (tot. in + out) None
Vertical 3.3 to 27.8 None
Concentric
Separate
EXTERNAL VENT SURFACES ARE HOT.
CAUTION
IT IS THE RESPONSIBILITY OF THE HOMEOWNER TO KEEP THE VENT
TERMINAL CLEAR OF SNOW AND ICE.
NOTE: USE ONLY LISTED COMPONENTS SUPPLIED WITH THE BOILER.
SURFACE DISCOLORATION OF THE BUILDING MAY OCCUR DUE TO
IMPROPER INSTALLATION. QHT, INC. WILL NOT ACCEPT RESPONSIBILITY
OF LIABILITY FOR SUCH DISCOLORATION.