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Multiple Heater Horizontal Venting Arrangement
Multiple Heater Venting (Connections into a Manifold)
LTU40-50
LTU60-75
LTS/U80-100
LTS/U110-130
LTS/U140-175
LTS/U180-200
LTS/U225-250
THE ABOVE ILLUSTRATIONS AND TABLE OF VENT SIZES FOR COMMON VENTING OF MULTIPLE HEATERS ARE IN
ACCORDANCE WITH THE NATIONAL FUEL GAS CODE ANSI Z223.1-LATEST EDITION, NFPA 54-LATEST EDITION, EQUIPMENT
VOLUME OF 1988 ASHRAE HANDBOOK, CURRENT CAN/CGA-B149.1/2-M86 INSTALLATION CODE, AND AGA PUBLICATION
NO. 10M5.85 2.5-2 ON FUNDAMENTALS OF GAS APPLIANCE VENTING AND VENTILATION-REVISED BUT ARE NOT A PART OF
THE CSA CERTIFICATION.
Form #43155010
Dec 2017
VENT SIZING TABLE — Multiple Heater Venting
1
2
4"
4"
4"
5"
4"
6"
4"
6"
4"
6"
6"
8"
6"
9"
COMMON VENT DIAMETER
(If a size is not available use the next larger size.)
-47-
Number of Heaters
3
5"
6"
6"
7"
8"
9"
10"
4
5
5"
6"
6"
7"
7"
8"
8"
9"
9"
10"
10"
11"
11"
12"
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