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  • Direct Fired (Make‑Up Air) – LP/NG – 4,500,000 BTU
The Hybrid Light Solutions ST4500 is an ultra‑high‑capacity 4,500,000 BTU direct‑fired make‑up air heater designed to deliver massive volumes of heated fresh air for the most demanding industrial, commercial, and large‑scale temporary applications. Operating on liquid propane (LP) or natural gas (NG), the ST4500 supports continuous ventilation, pressure balancing, and air replacement in environments with extreme exhaust and airflow requirements.
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Specifications may vary by brand. The details provided are accurate for the model shown above. For complete and up-to-date information, please review the manufacturer’s official specifications.
Models and brands may vary by location and availability.

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  • Models and brands may vary by location and availability.
  • Specifications and features are accurate for the model shown above but may differ across brands or regions.
  • For the most up-to-date details, refer to the manufacturer’s official specifications or contact our support team for assistance.

We strive to provide accurate product information to help you make informed purchasing decisions. If you have any questions, reach out to us before placing your order.

Hybrid Light Solutions ST4500 Make‑Up Air Heater
4,500,000 BTU heating capacity for extremely large spaces and high airflow demands
Direct‑fired make‑up air design delivers immediate, high‑efficiency heat
Dual‑fuel capability (LP or Natural Gas) for maximum fuel flexibility
Designed for continuous fresh‑air replacement and pressure balancing
Very high airflow output to support heavy ventilation and exhaust systems
Heavy‑duty industrial construction built for demanding environments
Suitable for permanent or large‑scale temporary installations
Heater Type

Direct‑Fired Make‑Up Air
Fuel Type

Liquid Propane (LP) / Natural Gas (NG)
Heat Output

4,500,000 BTU
Application

Industrial facilities, warehouses, shipyards, aircraft hangars, large temporary structures
Function

Heated make‑up air / continuous fresh air supply
Use Environment

Open or ventilated spaces
Operation

Continuous‑duty capable
Construction

Heavy‑duty, industrial‑grade design
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