UDBP Venting Requirements

ManualsBrandsReznor ManualsHeating SuppliesPower Vented Gas Fired Unit Heater - 60,000 BTU

Form I-UD&APD Series-V-PV (5-17), P/N 195675R20, Page 6

3.0 Venting

Requirements

and

Instructions

- Commercial/

Industrial

Installation

3.1 Type of Vent Pipe Required for Vent Run

A commercial/industrial installation may have either a horizontal or a vertical vent run

using one of the types of vent pipe listed. Do not intermix different vent system

parts from different manufacturers in the same venting system.

Horizontal

Vent Run

Vent pipe approved to UL Std 1738 for a Category III

appliance, OR

Appropriately sealed 26-gauge or heavier galvanized steel

or equivalent single-wall pipe

Vertical

Vent Run

Vent pipe approved to UL Std 1738 for a Category III

appliance, OR

Appropriately sealed 26-gauge or heavier galvanized steel

or equivalent single-wall pipe, OR

If at least 75% of the equivalent length of the vent run is

vertical - Double-wall (Type B) vent pipe

3.2 Vent Pipe

Diameter and

Length

TABLE 4 - Vent Pipe Diameter and Length for Horizontal and Vertical Vents

Vent pipe diameters and maximum vent lengths in TABLE 4 apply to both Horizontal

and Vertical vents. Add all straight sections and equivalent lengths for elbows. The

total combined length must not exceed the Maximum Vent Length. Minimum vent

length is 3 feet (1M). Use only one diameter of vent pipe on an installation.

Heater

Size

Vent Pipe

Diameter

Maximum

Vent Length

Equivalent Straight

Length for 90° Elbow

Equivalent Straight

Length for 45° Elbow

Field-supplied taper type

connection required at the

venter outlet

inches mm feet M feet M feet M

3 76 20 6.1 3 0.9 1.5 0.5 4” to 3” (102mm to 76mm) reducer

4 102 10 3 2 0.6 1 0.3 None

3 76 20 6.1 3 0.9 1.5 0.5 4” to 3” (102mm to 76mm) reducer

4 102 10 3 2 0.6 1 0.3 None

3 76 30 9.1 4 1.2 2 0.6 4” to 3” (102mm to 76mm) reducer

4 102 15 4.6 2 0.6 1 0.3 None

75 4 102 30 9.1 4 1.2 2 0.6 None

100 4 102 40 12.2 5 1.5 2.5 0.8 None

125 4 102 40 12.2 5 1.5 2.5 0.8 None

150 5 127 35 10.7 5 1.5 2.5 0.8 None

175 5 127 35 10.7 5 1.5 2.5 0.8 None

200 5 127 50 15.2 5 1.5 2.5 0.8 None

225 5 127 50 15.2 5 1.5 2.5 0.8 None

250 5 127 50 15.2 5 1.5 2.5 0.8 None

300 6 152 50 15.2 5 1.5 2.5 0.8 None

350

6 152 50 15.2 7 2.1 3.5 1.1 None

7 178 50 15.2 4.5 1.4 2.25 0.7 6” to 7” (152 to 178mm) enlarger

400

6 152 50 15.2 8 2.4 4 1.2 None

7 178 50 15.2 5 1.5 2.5 0.8 6” to 7” (152 to 178mm) enlarger

Commercial / Industrial Installation

Std Power Vent fan type or blower type unit heater - All Sizes