Table of Contents
Overview
The JELOSTONE commercial automatic door bottom is a 36-inch aluminum automatic door bottom with a Matte Black Anodized finish and a neoprene insert, designed to create a secure seal at the base of doors and automatically engage when the door closes. It uses drop bar seal actuation where a plunger contacts the jamb and the drop bar seal actuates from the hinge side first, creating multiple compression points intended to maintain a tight seal between the door and the floor. It is described as suitable for both Surface Applied and Semi-Mortise applications, and includes end plates and a screw pack for mounting.
For product details and configuration, see the automatic door bottom listing.
Key takeaways
- This automatic door bottom is described as aluminum with a neoprene insert and a Matte Black Anodized finish.
- Drop bar seal actuation is described as plunger-activated, with hinge-side-first actuation for multiple compression points.
- The product is described as compatible with Surface Applied or Semi-Mortise mounting applications.
- Net length is described as full length without trimming, and stock length can be trimmed with a maximum cut rule near the set screw.
- Included components are listed as the automatic door bottom, end plate, and screw pack.
What the product is designed to do
This product is described as an automatic door bottom designed to create a secure seal at the base of doors and automatically engage when the door closes. The listing describes the seal as intended to help maintain a tight seal between the door and the floor and describes functions to block the penetration of sound, air, smoke, and flames. It is described as suitable for Surface Mounted and Semi-Mortised applications, and recommended uses include doors of general household, clean room, office, laboratory, hospital, and industrial facility.
The listing also describes the product as UL-certified and states that it meets high standards for performance, safety, and environmental friendliness.
Materials, dimensions, and technical details
| Specification | Stated detail |
|---|---|
| Material | Aluminum |
| Material Type | Aluminum, Neoprene |
| Color | Matte Black Anodized |
| Size | 5/8‘’W x 36”L x 1-7/8‘’H |
| Product Dimensions | 36"L x 1.88"W |
| Item Thickness | 0.63 Inches |
| Item Weight | 1.8 Pounds |
| Included Components | Automatic Door Bottom, End Plate and Screw Pack |
The Matte Black Anodized configuration is listed with the 5/8‘’W x 36”L x 1-7/8‘’H dimensions in the product specifications.
Installation and placement notes
Two mounting approaches are described. Surface Mounted installation states that the plunger contacts the door stop. Semi-Mortised installation states that the plunger contacts the door rabbet. The drop-bar seal is described as actuated when the plunger contacts the jamb as the door is closing, forcing the drop-bar seal down against the floor or threshold.
The unit is described as provided in net length, meaning full length without trimming. Stock length automatic door bottoms can be trimmed to fit specific door sizes, and the listing states that the maximum cut should not be closer than 1-1/2 inches from the set screw. The set screw is described as located at the opposite non-plunger end, recessed into the extrusion about 4 inches in from that end. The 36-inch unit is described as able to be shortened to a minimum length of 33-1/2 inches after cutting.
The listing states an ideal clearance between the unit and the finished floor is 3/8 inch. For fire-labeled doors, mortise preparation must be done by the door manufacturer. For full package details, refer to the included end plate and screw pack.
Performance characteristics described in the listing
The plunger is described as requiring a low closing force to actuate the drop bar seal, with the letter L in the product number standing for low closing force. The hinge-side-first actuation is described as allowing multiple compression points that help maintain a tight seal between the door and the floor.
The listing states that when the door is fully closed, the automatic door bottom drops up to 3/4 inch, creating a tight seal against the floor to block air drafts, dust, light, and noise. It also describes enhanced soundproofing, weather protection, and draft exclusion, along with an adjustable plunger mechanism.
Review patterns buyers commonly mention
Across top reviews, buyers commonly mention that installation is easy when measuring and cutting to fit the door width carefully. Reviews frequently describe the product as sturdy or solid and mention that it works as expected after installation. A repeated concern in reviews mentions issues with end caps and small screws during installation.
Pros
- Surface Applied or Semi-Mortise installation is explicitly described.
- Low closing force actuation is stated in the product description.
- UL-certified with described functions to block sound, air, smoke, and flames.
- Top reviews commonly mention easy installation and solid construction.
Cons
- Trimming must follow a maximum cut limit near the set screw.
- Top reviews commonly mention issues with end caps and small screws.
- Some cutting is commonly mentioned as required for proper fit.
FAQ
How does this automatic door bottom activate?
The listing describes drop bar seal actuation where the plunger contacts the jamb as the door is closing and forces the drop-bar seal down against the floor or threshold.
Is this model compatible with Surface Mounted and Semi-Mortised installation?
The product description states it is suitable for both Surface Mounted and Semi-Mortised applications, with the plunger contacting the door stop or the door rabbet depending on the installation type.
Can the 36-inch unit be trimmed?
The listing states that stock length automatic door bottoms can be trimmed to fit specific door sizes and that the maximum cut should not be closer than 1-1/2 inches from the set screw. It also states the 36-inch unit can be shortened to 33-1/2 inches after cutting.
What clearance is recommended during installation?
The listing states that the ideal clearance between the unit and the finished floor is 3/8 inch.
What components are included?
The included components are listed as the automatic door bottom, end plate, and screw pack, with end plates provided for mounting applications.
How far does the seal drop when the door is closed?
The listing states that when the door is fully closed, the automatic door bottom drops up to 3/4 inch to create a tight seal against the floor.