Detroit-radiant-products-company FA Series Manuel d'utilisateur télécharger pdf (Page 27)

FA Series

3.0 Installation • Rooftop Venting • Horizontal Venting (Category III)

Figure 3.6 • Rooftop Venting - Side View

Horizontal Venting (Category III)

An appliance that operates with a positive vent static pressure and with a vent gas temperature that

avoids excessive condensate production in the vent is said to be ‘Category III’. The FA Series heater is

considered a Category III appliance if the venting system meets all of the following criteria:

• The vent system terminates horizontally (sideways).

• The vent terminates vertically, but the length of the horizontal portion of the vent run exceeds 75% of

the vertical rise length. (e.g.- If the vertical vent height is 10 feet, the horizontal run is greater than

7-1/2 feet).

• The vent terminates below 5 feet of the vent connection on the unit.

Seal vent pipes with high temperature sealant and three (3) #8 sheet metal screws. Vent enclosed

spaces and buildings according to the guidelines in this manual and applicable national, state,

provincial and local codes.

You may either use an agency certiﬁed Category III venting system, or single wall vent pipe with all the

seams and joints sealed with metallic tape or silicone sealant suitable for temperatures up to 400°F.

Wrap the tape two full turns around the vent pipe. For single wall vent systems, one continuous section

of double wall vent pipe may be used with the vent system to pass through a wall or barrier.

All horizontal Category III vents must be terminated with a Simpson-Duravent sidewall vent cap (P/N:

SWD-4 for 4-inch venting or P/N: SWD-6 for 6-inch venting).

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

Vent Cap

Double-Wall B-Vent Pipe

Firestop Spacer

B to C Adapter

Roof

24 in. Min.*

Heater

Clean Out Tee Fitting

Clean Out Cap

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Detroit-radiant-products-company FA Series Manuel d'utilisateur Page 27