Detroit-radiant-products-company FA Series Manuel d'utilisateur télécharger pdf (Page 25)

FA Series

Figure 3.5 • General Vent Requirements

When possible, avoid venting through an unconditioned space. Venting through an unconditioned space

promotes condensation. When venting through an unconditioned space is unavoidable, or if the unit is

installed in an area that is prone to condensation, insulate venting runs greater than 5 feet to minimize the

production of condensation. Inspect for leakage prior to insulating the venting and only use insulation that

is non-combustible with a temperature rating of not less than 400°F. Install a tee ﬁtting at the low point of

the vent system and provide a drip leg with a clean out cap as shown in Figure 3.5.

When venting pipe passes through a combustible interior wall or ﬂoor, a metal thimble with a diameter 4

inches greater than the vent pipe diameter must be used. If there is 6 feet or more of vent pipe prior to

passing through the combustible wall or ﬂoor, then the metal thimble need only be 2 inches greater than

the vent pipe diameter. If a metal thimble is not used, all clearance to combustibles from the vent pipe

must be 6 inches. Where permitted, type B vent may be used for the last section of vent pipe to reduce

the required clearance to combustibles when passing through a combustible wall or ﬂoor. When using

type B venting, follow the manufacturer’s recommended clearance to combustibles. Any material used to

close or insulate the opening must be non-combustible.

3.0 Installation • General Venting Requirements

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

24 in.

Min.*

Double-Wall B Vent

Roof*

Heater

1 in. Minimum Clearance

Fire Stop Spacer

#8 Sheet Metal Screws (ﬁeld supplied)

Adjustable Roof Flashing

Storm Collar

B to C Adapter

Clean Out Tee Fitting

Vent Cap

Clean Out Cap

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 55 56

Pas de commentaire

Detroit-radiant-products-company FA Series Manuel d'utilisateur Page 25