Door Undercut For Ventilation

Cutting into it could result in the failure of the door.

Door undercut for ventilation. In most applications the door undercut would need to be 1 5 inches or greater to allow enough air to pass. Door under cut or door grill or fresh air duct. Both intermittent spot ventilation and continuous. Carpets will filter the air and remove all the candle soot and other airborne particulate as it is forced under the bedroom door due to a high pressure difference.

Semmelhack believes the air flow through the sides and top of the door is equal to the air flow through the undercut. Consider installing a transfer grille in the door or employing another return air pathway method such as transfer grilles or jump ducts. Any clearance under the bottom of the door while it is in the closed position that exceeds inch will be considered non compliant. Door undercuts are often obstructed by carpets further reducing return pathways.

Other alternative pathways are jump ducts and transfer grills. Whole house ventilation should be considered. Apartments helps to assure healthy indoor air quality. The video on the training tab shows one of these options transfer grilles.

There are after market devices available that you can install on the door to fill that gap but you must be very careful as you can only install devices that have been listed by an independent testing laboratory i e. Standard door undercut plus a small jumper duct always with fully extended flexible duct to the return zone can only handle up to about 100 cfm. There are some through the door alternatives that can be effective. The simplest pathway is a door undercut but often it needs to be pretty high 1 1 2 in or greater in order to allow enough air to pass.

So if you have an hvac system with a central return keep the interior doors open or create pathways for air to move freely inside the house. The door undercut gets all the attention but the sides and top of the door also allow a good amount of air to flow through. One of the best ways during design to figure out if you ve oversized the hvac system is whether you can get the air back out of the bedrooms with 3 pa or less pressure across the doors. Poor ventilation occurs in a home when climate control ducts apply unequal pressure to different rooms causing heating cooling and humidity issues.

Properly sized ventilation in airtight homes and. Ul fm approval intertek that have been approved for that purpose. Intermittent ventilation is used to exhaust sources of.