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Figure 2 - Ventilation Air From Inside Building If Applicable Or Remove Door into Adjoining Room, Option 3 Ventilation Grills Into Adjoining Room, Option 2 12" 12" Ventilation Grills into Adjoining Room, Option 1 Outlet Inlet Air Air Figure 3 - Ventilation Air From Outdoors 105056 5 BLUE-FLAME VENT-FREE PROPANE/LP AND NATURAL GAS GREENHOUSE CO2 GENERATOR INSTALLATION NOTICE: The intended use of this appliance is the generation of carbon dioxide inside greenhouses for plant production. NOTICE: A