The gap, which is usually about one inch, is there for air circulation in older mobile homes. The open slot under the door is especially important when the air conditioning system is operating. The HVAC system in a manufactured home cannot effectively push air into a completely closed room when there is no way for the air that is being displaced to return to the system. The opening under the door provides a way for the air to escape and, without the gap under a door, the air conditioner (or furnace) would simply pressurize the room.
Newer mobile homes have a louvered vent panel above the door, called a transfer grille, which also helps to provide natural air flow into the room when the HVAC system is off. Because of the difference in temperature between air near the floor and air near the ceiling in a room, a natural circulation of warmer air will go through the louvered vent above the door, with cool air pulled under the door at the same time.
Also, see our blog posts What is the purpose of the vent grille over the bedroom door? and What is a jump duct?
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Here’s links to a collection of our blog posts about MOBILE/MANUFACTURED HOMES:
• Where can I file a complaint if I have problems with my new or used manufactured/mobile home in Florida?
• What are the most common defects in mobile/manufactured home foundation piers?
• How do I determine the age of a very old mobile home?
• What is a "HUD label verification letter" for a mobile/manufactured home?
• When did a ground cover vapor barrier (plastic sheet) become required under a mobile/manufactured home?
• Is it safe to go under a mobile home?
• Are older mobile homes unsafe?
• What do I need to know about buying a foreclosed mobile home?
• Does it make sense to buy an older mobile home and remodel it?
• Where do I find the vehicle identification number (VIN) on a mobile home?
• How do I find out how old a mobile home is and who manufactured it?
• What is the right price for a used mobile home?
• How energy efficient is a mobile home?
• When were the first double-wide mobile homes manufactured?
• How do I upgrade my old (pre-1976) mobile home to meet HUD standards?
• What size air conditioner is right for my mobile home?
• Can you move an older mobile home in Florida?
• What does the HUD tag look like and where do I find it on a mobile home?
• Can you put a zone 1 mobile home in Florida?
• How can I remove water under my mobile home?
• What's the differences between a trailer, a mobile home, a manufactured home, and a modular home?
• What is a D-sticker mobile home?
• What are the tie-down requirements for a mobile home?
• How fireproof is a mobile home?
• Can I install a mobile home myself?
• What is a Park Model mobile home?
• Does an addition to a mobile home have to comply with the HUD Code?
• What walls can I remove in a mobile home?
• What can I do to prevent dampness and mold in my mobile home?
• How can I tell if a mobile home is well constructed?
• How can I tell the difference between a manufactured home and a modular home?
Visit our MOBILE/MANUFACTURED HOMES page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.