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Amazon.com: 2-Units Indoor Heaters, 30,000-BTU Natural Gas Heater for Home Use ( Blue Flame ) : Home & Kitchen
Mr. Heater 20k Btu Natural Gas Blue Flame Heater With Built In Vent Free Blower : Target
ProCom Heating Natural Gas Vent Free Infrared Gas Space Heater - 20,000 BTU, T-Stat Control - Model# MN2PTG - Factory Buys Direct
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HeatStar Blue Flame Heater - 30,000 BTU Natural Gas | Grandio Greenhouses
Avenger 30000-BTU Wall or Floor-Mount Indoor Natural Gas Vent-Free Infrared Heater at Lowes.com