Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
NATIONAL GUARD Automatic Door Bottom: Single Fin Insert - Automatic Door Bottoms
NATIONAL GUARDAutomatic Door Bottoms

NATIONAL GUARD Automatic Door Bottom: Single Fin Insert

The NATIONAL GUARD Automatic Door Bottom is a single-fin insert model (MPN 420NHMDKB-4) made of aluminum, measuring 48 inches in length and 2 5/16 inches in width. This product is designed to seal the gap under a…

SKU 3G-OTH-515140

Also listed as: 420NHMDKB4 · 420NHMDKB 4

Brand
NATIONAL GUARD
Item
Automatic Door Bottom: Single Fin Insert
Part Number
420NHMDKB-4
Category
Automatic Door Bottoms
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

NATIONAL GUARD
Manufacturer Part Number
420NHMDKB-4
Type
Aluminum, Aluminum
Lg
48 in
Wd
2 5/16 in

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

NATIONAL GUARD Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The NATIONAL GUARD Automatic Door Bottom is a single-fin insert model (MPN 420NHMDKB-4) made of aluminum, measuring 48 inches in length and 2 5/16 inches in width. This product is designed to seal the gap under a door, helping to block drafts, light, and sound.

Frequently Asked Questions

What is the NATIONAL GUARD Automatic Door Bottom used for?

The NATIONAL GUARD Automatic Door Bottom seals the gap under a door to block drafts, light, and sound. It is commonly installed on commercial or industrial doors in offices, hospitals, and manufacturing facilities to improve energy efficiency and acoustic privacy.

What are the specifications of the NATIONAL GUARD 420NHMDKB-4?

This NATIONAL GUARD Automatic Door Bottom is a single-fin insert model (MPN 420NHMDKB-4) made of aluminum. It measures 48 inches in length and 2 5/16 inches in width. The aluminum construction provides durability and corrosion resistance for long-term use.

Where to buy the NATIONAL GUARD Automatic Door Bottom worldwide?

3G Electric supplies the NATIONAL GUARD Automatic Door Bottom (420NHMDKB-4) to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this item.

How to install a NATIONAL GUARD Automatic Door Bottom?

Install the NATIONAL GUARD Automatic Door Bottom by cutting it to the exact door width, then attaching it to the bottom edge using screws provided. Ensure the fin aligns with the door stop to create a consistent seal. Follow the manufacturer's template for precise placement.

Not sure this is the right part? Photo-identify it→

NATIONAL GUARD Products

3G Electric supplies NATIONAL GUARD automatic door bottoms. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from NATIONAL GUARD

View all NATIONAL GUARD parts →
This automatic door bottom seals the gap under a door to block drafts, light, and sound. Made of aluminum, it measures 48 inches in length and 2 1/4 inches in width. Suitable for commercial and industrial door applications requiring a corrosion-resistant seal
NATIONAL GUARD
This automatic door bottom seals the gap under a door to block drafts, light, and sound. Made of aluminum, it measures 48 inches in length and 2 1/4 inches in width. Suitable for commercial and industrial door applications requiring a corrosion-resistant seal
This automatic door bottom seals the gap under a door to block drafts, light, and sound. It is commonly installed in commercial and industrial facilities to improve energy efficiency and room privacy. Constructed of aluminum with a single fin insert, it measures 36 inches in length and 1 3/8 inches in width
NATIONAL GUARD
This automatic door bottom seals the gap under a door to block drafts, light, and sound. It is commonly installed in commercial and industrial facilities to improve energy efficiency and room privacy. Constructed of aluminum with a single fin insert, it measures 36 inches in length and 1 3/8 inches in width

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first