LG · Laundry · DLEX4000B · Owner's Manual
No. Gas dryers must exhaust outdoors, and the manual says not to vent into enclosed or unventilated spaces such as an attic, wall, ceiling, crawl space, chimney, gas vent, or concealed space.
Source: LG DLEX4000B Owner's Manual, extracted pages 17-20
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Safety Instructions and Fire Hazards
Read all instructions before using the dryer. These safety rules are there to help prevent fire, explosion, electric shock, scalding, injury, and property damage.
Key fire and explosion warnings
LG DLEX4000B Owner's Manual, extracted pages 3-7Vent kit installation and vent routing
This dryer is configured to vent to the rear, but it can also vent to the bottom or side.
Before you begin - Wear long-sleeved gloves and safety glasses. - Use a heavy metal vent. - Do not use plastic or thin foil ducts. - Clean old ducts before installing the appliance. - Ductwork and fittings are not included and must be purchased separately. - If you want to change the vent location, an adapter kit, part number 383EEL9001B, may be purchased from your LG retailer. - Right-side venting is not available on gas models.
LG DLEX4000B Owner's Manual, extracted pages 17-20This answer is only published when it has a reviewed answer status and a source citation back to the manual text.