---
product_id: 528941491
title: "TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1\" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches)"
brand: "trademark soundproofing"
price: "₩674629"
currency: KRW
in_stock: true
reviews_count: 5
category: "Trademark Soundproofing"
url: https://www.desertcart.kr/products/528941491-tms-automatic-drop-down-door-seal-mortise-mount-36-inch
store_origin: KR
region: South Korea
---

# 1" airtight neoprene seal blocks sound & drafts Fully mortised 36" door mount, concealed design Aircraft-grade aluminum casing TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches)

**Brand:** trademark soundproofing
**Price:** ₩674629
**Availability:** ✅ In Stock

## Summary

> 🚪 Seal the deal with silent sophistication!

## Quick Answers

- **What is this?** TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) by trademark soundproofing
- **How much does it cost?** ₩674629 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/528941491-tms-automatic-drop-down-door-seal-mortise-mount-36-inch)

## Best For

- trademark soundproofing enthusiasts

## Why This Product

- Trusted trademark soundproofing brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Invisible Integration:** Mortise-mounted inside the door for a sleek, clean look—no visible hardware disrupting your door’s aesthetic.
- • **Effortless Automatic Operation:** Spring-loaded mechanism raises the seal when the door opens, preventing floor drag and wear.
- • **Seamless Sound & Draft Barrier:** Neoprene bulb drops automatically to block noise, light, smoke, and drafts with a perfect 1" seal.
- • **Fire-Rated Safety & Versatility:** Self-extinguishing neoprene seal meets fire code requirements, ideal for offices, studios, and upscale commercial spaces.
- • **Precision Engineered Durability:** Heavy-duty aluminum frame ensures long-lasting, professional-grade performance.

## Overview

The TMS Automatic Drop Down Door Seal is a 36-inch, mortise-mounted door bottom seal crafted from aircraft-grade aluminum with a precision spring mechanism. It features a 1-inch self-extinguishing neoprene bulb that automatically drops to block sound, light, drafts, and smoke, providing an airtight seal. Designed for professional installation on standard wooden doors, it offers a concealed, durable, and fire-rated solution ideal for noise-sensitive and high-traffic environments.

## Description

This Heavy Duty Soundproofing Fully Mortised Automatic Door Bottom Seal from Trademark Soundproofing is built for spaces where door gap leakage is a real problem: recording studios, home music rooms, office suites, hotel corridors, and commercial buildings with noise or fire code requirements. The aluminum casing houses a precision spring-loaded mechanism that automatically raises the neoprene bulb seal clear of the floor when the door opens, then drops it into full contact with the floor when the door closes. This means no floor drag, no wear on the seal from foot traffic, and a tight, consistent seal every time the door shuts. The neoprene bulb is rated self-extinguishing, making this sweep appropriate for fire-rated door assemblies. The fully mortised design installs inside the door body, keeping the door face clean and the mechanism concealed. Designed for 36-inch wooden doors. Fits doors with a 1" drop requirement. All mounting hardware included.

Review: Awesome piece of hardware for professional installation - Wow this was a pain in the butt to install, but it works and looks amazing! I live in a condo and can't change the look of the outside of my front door, so this was the only feasible alternative to those cheap sliding foam door sweeps. The construction feels very solid and the mechanism is smooth - no one knows it's there unless I point it out. Just keep in mind you need a solid door and professional tools. A local woodworking shop crafted a jig and routed it; a metal chop saw worked well to trim it a small amount to fit in a 35-7/8" with end plates. Another thing to keep in mind is that it can clearly handle angles/slants in the frame no problem, but can't seal gaps caused by waves, divots, or similar, curved imperfections. The drop adjustment was easy, but no way of knowing if it will stay put over time. If anything changes, I'll update this review.
Review: Missing gasket: product ineffective - Despite arriving sealed and new-in-packaging, the product is missing a very important piece: the gasket (see pictures). The product listing shows the gasket, as seen highlighted in red in first attached photo. However, upon receiving the sealed, unopened product, it did not contain this part. As such, its ability to create an air seal between faces of the door is entirely compromised, as well as any “soundproofing” capabilities. In reviews for other similar products (different lengths) by same manufacturer I am now seeing similar complaints about the same part missing. It’s upsetting to see that after several years, these products are still being sold without the shown parts from the listing. Update: I contacted the manufacturer, to which they seemed very surprised (though I'm unsure how, as this issue has been reported in the reviews of these products since at least 2019). They told me order replacement through desertcart. I received the replacement, which like its predecessor, is also missing the same gasket/seal. I will contact the company again and will update this review if the issue is addressed. Until then, it's a safe assumption the entire batch is missing this critical part.

## Features

- Heavy Duty Aluminum Construction - The casing is aircraft-grade aluminum with a precision spring-loaded mechanism and a solid neoprene bulb seal.
- Stops Sound, Light, Smoke, and Drafts Under Your Door - The neoprene bulb drops automatically when the door closes, sealing gaps up to 1" with an airtight fit.
- Fully Mortised into the Door Body, 36 Inches - The sweep installs inside the door bottom (mortise-mount), so the door face stays clean and the seal is completely concealed when the door is open. Compatible with standard wooden doors with a 1-3/8" or wider bottom rail.
- Solid neoprene seal is self-extinguishing fire-rated preventing sound, lights, smoke, and, draft stoppers weatherstrip insulation.
- Automatic Functionality, No Floor Contact When Open - The spring mechanism raises the seal the moment the door opens and drops it flush to the floor when the door closes, protecting the seal from wear and making the door smooth to swing.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00MEHOMY2 |
| Brand | Trademark Soundproofing |
| Brand Name | Trademark Soundproofing |
| Colour | Steel |
| Customer Reviews | 3.5 out of 5 stars 32 Reviews |
| Included Components | Automatic Door Bottom mortised |
| Item Type Name | Automatic Door Bottom |
| Manufacturer | Trademark Soundproofing |
| Manufacturer Part Number | 463A |
| Material | Neoprene , Rubber |
| Material Type | Neoprene, Rubber |
| Model Number | TM463A |
| Number of Items | 1 |
| Recommended Uses For Product | Soundproofing, sealing gaps under doors, preventing sound and drafts, high-frequency traffic, rough floor surfaces such as concrete Recommended Uses For Product Soundproofing, sealing gaps under doors, preventing sound and drafts, high-frequency traffic, rough floor surfaces such as concrete See more |
| UPC | 881314880492 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Trademark Soundproofing
- **Material:** Neoprene, Rubber
- **Colour:** Steel
- **Recommended Uses For Product:** Soundproofing, sealing gaps under doors, preventing sound and drafts, high-frequency traffic, rough floor surfaces such as concrete
- **UPC:** 881314880492

## Images

![TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) - Image 1](https://m.media-amazon.com/images/I/61o2UGPQX0L.jpg)
![TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) - Image 2](https://m.media-amazon.com/images/I/71ng2p+kcSL.jpg)
![TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) - Image 3](https://m.media-amazon.com/images/I/713rxEiWsTL.jpg)
![TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) - Image 4](https://m.media-amazon.com/images/I/81Q24jqsdKL.jpg)
![TMS Automatic Drop Down Door Seal, Mortise Mount, 36 Inch, 1" Drop, Heavy Duty Aluminum with Neoprene Bulb Seal, Blocks Sound, Light, Draft and Smoke, (36 Inches) - Image 5](https://m.media-amazon.com/images/I/51hnN5M4yQL.jpg)

## Questions & Answers

**Q: Q: How is this different from a regular door sweep?**
A: A regular door sweep drags along the floor every time the door moves, wearing down the seal and creating friction. This sweep retracts automatically when the door opens and drops flush to the floor only when the door closes.

**Q: Will this actually block sound, or is it just a draft stopper?**
A: It does both, but the mechanism is what makes it effective for sound. The neoprene bulb drops under spring pressure to form a tight seal across the full 36-inch width of the door bottom, closing the gap that lets both air and sound pass through

**Q: Is this hard to install?**
A: The sweep mortises into the bottom of the door not surface-mounted on the face, it requires routing a slot in the door bottom. If you're ok with a router or have a carpenter handle that step, the installation is straightforward, hardware included.

**Q: What gap size does it seal?**
A: The sweep is designed for a 1-inch drop, meaning it can seal gaps up to 1 inch between the door bottom and the floor. It works on level hard floors (hardwood, tile, concrete) and on low-pile carpet.

**Q: My door gets a lot of daily use. Will the mechanism hold up?**
A: The casing is aluminum with a precision spring-loaded mechanism, which is the same construction used in commercial and hospitality installations that see hundreds of cycles per day.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Awesome piece of hardware for professional installation
*by S***E on 9 November 2017*

Wow this was a pain in the butt to install, but it works and looks amazing! I live in a condo and can't change the look of the outside of my front door, so this was the only feasible alternative to those cheap sliding foam door sweeps. The construction feels very solid and the mechanism is smooth - no one knows it's there unless I point it out. Just keep in mind you need a solid door and professional tools. A local woodworking shop crafted a jig and routed it; a metal chop saw worked well to trim it a small amount to fit in a 35-7/8" with end plates. Another thing to keep in mind is that it can clearly handle angles/slants in the frame no problem, but can't seal gaps caused by waves, divots, or similar, curved imperfections. The drop adjustment was easy, but no way of knowing if it will stay put over time. If anything changes, I'll update this review.

### ⭐ Missing gasket: product ineffective
*by Z***K on 11 October 2023*

Despite arriving sealed and new-in-packaging, the product is missing a very important piece: the gasket (see pictures). The product listing shows the gasket, as seen highlighted in red in first attached photo. However, upon receiving the sealed, unopened product, it did not contain this part. As such, its ability to create an air seal between faces of the door is entirely compromised, as well as any “soundproofing” capabilities. In reviews for other similar products (different lengths) by same manufacturer I am now seeing similar complaints about the same part missing. It’s upsetting to see that after several years, these products are still being sold without the shown parts from the listing. Update: I contacted the manufacturer, to which they seemed very surprised (though I'm unsure how, as this issue has been reported in the reviews of these products since at least 2019). They told me order replacement through Amazon. I received the replacement, which like its predecessor, is also missing the same gasket/seal. I will contact the company again and will update this review if the issue is addressed. Until then, it's a safe assumption the entire batch is missing this critical part.

### ⭐⭐⭐⭐⭐ Five Stars
*by S***P on 20 January 2018*

Work great, really!

## Frequently Bought Together

- TMS Automatic Door Bottom Seal - Heavy Duty Metal Door Sweep with Neoprene Bulb Door Seal - 1" Drop - Fully Mortised (36 Inches)
- Pemko - 4131CRL36 Aluminum Automatic Door Bottom, Clear Anodized, Insert, 19/32”W x 36"L x 1-27/32”H

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-07-18*