Weather-Rite UHA100 Installation, Operation & Service Manual - page 16
Manual is about: Tubular Unit and Utility Heaters
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Figure 4: Installation Clearances and Clearances to Combustibles
* Recommended mounting height varies with heater input.
Heaters may be mounted at a higher level if destratification
fans are installed.
Clearance to Vent: 2" (5 cm)
**23" (58.4 cm) minimum is
necessary for servicing.
The heater must always be installed at least 6' (1.8 m) above the floor.
The vent pipe must have clearance from combustibles by 2" (5 cm).
If installed at low levels where individuals can come in contact with hot heat exchanger components,
adequate guarding must be provided.
All distances are minimum clearance requirements for service access, airflow and safety.