Detroit-radiant-products-company FA Series Manuel d'utilisateur télécharger pdf (Page 29)

FA Series

3.0 Installation • Common Venting (Category I) • Common Rooftop Venting

Common Venting (Category I)

The common vent system and all attached appliances must be Category I.

The vent connector should be routed in the most direct route from the units to the common vent.

Where two or more vent connectors enter a common gas vent or chimney ﬂue, the smaller

connector shall enter at the highest level consistent with the available head room or clearance to

combustible material.

Restrictions within the common vent such as elbows should be minimized. Each elbow installed

within the common portion of the vent carrying system reduces the maximum common vent

capacity by 10%. Refer to NFPA 54 IFEC tables 11.2 and 11.3 for capacity.

The vent connector capacities allow for the use of two 90° directional changes. For each

additional required elbow, the vent connector capacity is reduced by 10%.

The common vent cross sectional area must be equal to or greater than the largest vent

connector cross sectional area.

Figure 3.8 • Common Rooftop Venting - Side View

Rooftop Vent Cap

Roof

Dual Exhaust Assembly

Heater

Firestop Spacer

Double-Wall B-Vent

24 in.

M i n.**

Heater

**Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

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Detroit-radiant-products-company FA Series Manuel d'utilisateur Page 29