Table of Contents
Overview
The JELOSTONE commercial automatic door bottom uses aluminum construction, a neoprene insert, and a Matte Black Anodized finish. It creates a secure seal at the base of a door and engages automatically when the door closes.
The unit is designed to maintain a tight seal between the door and floor. Also, it supports blocking sound, air, smoke, flames, drafts, dust, and light. The seal drops up to 3/4 inch when the door fully closes.
This automatic door bottom seal suits Surface Applied and Semi-Mortise applications. It comes with an end plate and screw pack for mounting.
Key takeaways
- The aluminum body includes a neoprene insert and Matte Black Anodized finish.
- The plunger activates the drop bar seal as the door closes.
- Hinge-side-first actuation creates multiple compression points against the floor.
- The unit supports Surface Applied and Semi-Mortise mounting methods.
- The 36-inch length can be shortened to a minimum of 33-1/2 inches.
- The seal drops up to 3/4 inch when the door fully closes.
What the product is designed to do
The automatic door bottom creates a seal between the lower edge of a door and the floor. Also, its drop bar engages only as the door approaches the closed position.
The plunger contacts the jamb and forces the seal downward against the floor or threshold. As a result, the mechanism supports sound blocking, draft exclusion, weather protection, and control of light and dust.
Recommended uses cover household doors, clean rooms, offices, laboratories, hospitals, and industrial facilities. The acoustic door sealing guide offers related context for sealing door gaps as part of a wider project.
Materials, dimensions, and technical details
| Specification | Detail |
|---|---|
| Primary materials | Aluminum and neoprene |
| Finish | Matte Black Anodized |
| Size | 5/8-inch wide by 36-inch long by 1-7/8-inch high |
| Thickness | 0.63 inches |
| Weight | 1.8 pounds |
| Maximum drop | Up to 3/4 inch |
| Included components | Automatic door bottom, end plate, and screw pack |
The 36-inch aluminum door seal comes in net length, meaning full length before trimming. Also, the adjustable plunger supports low closing force actuation.
Installation and placement notes
Surface Mounted installation places the plunger against the door stop. However, Semi-Mortised installation places the plunger against the door rabbet.
As the door closes, the plunger contacts the jamb and activates the drop bar. Next, the seal moves downward against the floor or threshold from the hinge side first.
The ideal clearance between the unit and finished floor is 3/8 inch. Proper installation also requires careful measuring before any cutting begins.
The 36-inch unit can be shortened to 33-1/2 inches. However, the cut must remain at least 1-1/2 inches from the set screw. That screw sits at the non-plunger end, about four inches inside the extrusion.
For fire-labeled doors, the door manufacturer must complete the mortise preparation. The soundproof door installation guide covers broader door replacement and installation considerations.
Performance characteristics described
The plunger uses low closing force to activate the drop bar seal. Also, hinge-side-first movement creates multiple compression points between the door and floor.
When the door fully closes, the seal drops up to 3/4 inch. As a result, it creates a tight contact point against the floor.
The supported functions include blocking noise, air drafts, dust, and light. The product text also connects the seal with enhanced soundproofing, weather protection, and draft exclusion.
This is a practical fix for an open gap beneath a door. However, its stated function focuses on sealing that gap rather than changing other parts of the door assembly.
The adjustable drop bar mechanism allows the seal to engage during closing. It then lifts when the door opens.
Review patterns buyers commonly mention
Buyers commonly connect easy installation with careful measuring and cutting. Also, repeated feedback calls the construction sturdy or solid.
Users often report that the unit works as expected after installation. However, repeated concerns involve the end caps and small screws during fitting.
Pros
- Supports Surface Applied and Semi-Mortise installation.
- Uses low closing force actuation.
- Drops up to 3/4 inch against the floor.
- Blocks sound, air drafts, dust, and light.
- Includes an end plate and screw pack.
Cons
- Cutting requires attention to the set screw position.
- The 36-inch unit only shortens to 33-1/2 inches.
- Fire-labeled doors require manufacturer-completed mortise preparation.
- Repeated feedback raises concerns about end caps and small screws.
FAQ
How does the automatic door bottom activate?
The plunger contacts the jamb while the door closes. It then forces the drop bar seal downward against the floor or threshold.
Can this unit support two mounting methods?
Yes. It supports Surface Applied and Semi-Mortise applications, with different plunger contact points for each method.
Can the 36-inch seal be trimmed?
Yes. It can be shortened to 33-1/2 inches, while keeping the cut at least 1-1/2 inches from the set screw.
What floor clearance supports installation?
The stated ideal clearance between the unit and finished floor is 3/8 inch.
What comes with the door bottom?
The package includes the automatic door bottom, an end plate, and a screw pack.
What does the seal block?
The seal supports blocking sound, air, smoke, flames, drafts, dust, and light at the base of the door.