Schwank UHE Installation & Owner's Manual page 25

TABLE 5 COMBINED SYSTEM LENGTH: TUBE + AIR DUCT + VENT
Installations up to 4500 ft - Higher altitudes refer to Section 27
Do Not Exceed
Maximum
Input
Combined
(Btuh)
System Length
4" Air Duct 5" Air Duct
60,000 60 ft
90,000 80 ft
130,000 100 ft
160,000 100 ft
200,000 120 ft
HEATER EXPANSION AND VENT CONFIGURATION
A radiant tube heater will expand and contract as it heats and cools. Configuration of the vent must
allow for heater expansion.
VERTICAL VENT: Orientation of the vent at 90° to heater will allow for heater expansion and
contraction.
HORIZONTAL VENT: (See FIG. 15)
Wall Thimble or flashing at wall
◼
that allows movement of the vent
through the opening. Do not seal
the vent to the thimble or flashing
with caulking.
OR
Offset vent with two x 90° elbows.
◼
Install minimum 12 inch [305 mm]
length of straight vent between
elbows. Vent can be sealed with
caulking at non-combustible wall.
Other means of slip fit installation
◼
of the vent are acceptable provid-
ing there is adequate allowance
for free expansion and contraction
of the system, and free flow of
vent gases.
COMMON VENTING
For vertical vent only, two heaters can be commonly vented using 4"x 6"x 4" Vent Tee JA- 0514-XX.
Both heaters must be operated using one common thermostat. Common vent is 6 inch [150 mm] di-
ameter.
Category III (horizontal vent) heaters cannot be common vented.
Max. Air Duct
Length (ft)
(by Duct Diameter)
4" Ø / 5" Ø
80 ft 30 / 50
100 ft 30 / 50
120 ft 30 / 50
120 ft 30 / 50
140 ft 30 / 50
Max. Vent
Length (ft)
Individual: 4"Ø
Combined: 6"Ø
30
40
40
40
50
FIGURE 15: ALLOW FOR HEATER EXPANSION
- HORIZONTAL VENT - TOP VIEW
25
Example
160,000 Btuh Heater:
Tube Heater Length
1 x 90° elbow (vent)
Straight vent
1 x 90° elbow (duct)
Air Duct: 4" Ø
Combined Length
Max. Allowed
Additional 20' for 5" Ø Air Duct
UHE-F / EIH-F I&O Manual
50 ft
5 ft
20 ft
5 ft
17 ft
97 ft
100 ft
IM100205
RD: APR 2019
RL: 02C