Door Undercuts
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Https amzn to 2tftgup here is the blade i use in the video.
Door undercuts. 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. Note the difference between undercut. Door undercuts are a commonly used method for pressure balancing between rooms figure 1 but they are not a recommended approach as they do always provide an adequate return air pathway for hvac systems. 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.
Buy a good multi tool here. Ul fm approval intertek that have been approved for that purpose. Doors are undercut to provide clearance above the finish floor material. Seasonal changes in wood can result in variations in the height of the door undercut opening.
Sion from the bottom of the door to the bottom of the frame. Any clearance under the bottom of the door while it is in the closed position that exceeds inch will be considered non compliant. Any clearance under the bottom of the door while it is in the closed position that exceeds inch will be considered non compliant. I figured the in.
Undercuts on the doors to the three bedrooms in one of my rental houses were inadequate. 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. Typically they are undercut inches to inches from the bottom of the frame. Other alternative pathways are jump ducts and transfer grills.
To be sure i did some testing. This article addresses the issue of undercutting bedroom doors to provide return airflow from bedrooms resulting in risks such as insufficient airflow pressure imbalance energy inefficient loss of conditioned air condensation within the wall and moisture durability issues. So if you can get 60 cfm under the door you can get about 120 cfm total. 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.
Ul fm approval intertek that have been approved for that purpose.