HotLok Rack Mount Round Brush Grommet, 4″

SKU: 40002 (40/cs) Category: Tag:

HotLok Rack Mount Round Brush Grommet, 4″. Seals cable openings in server rack cutouts to maximize cooling efficiency.

Sold in case quantities of 40 per case.

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SKU: 40002 (40/cs) Category: Tag:

HotLok Rack Mount Round Brush Grommets seal 4” cable openings in new and existing server rack cutouts to block bypass airflow and maximize cooling system efficiency. Plus, its revolutionary sealing technology greatly reduces costly bypass airflow, increasing usable cooling unit capacity, and ensuring maximized efficiency from HVAC equipment. Manufactured by Upsite Technologies.

Sold in case quantities of 40 per case


  • Allows product installation or removal without disturbing cables
  • No loose or partially fastened parts, which can become separated or fall into the rack
  • Impact-resistant and durable
  • HBT Membrane Layer ensures maximum air containment
  • Compliant with Directive 2002/95/EC of the European Parliament and the Council on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electric Equipment (RoHS)


  • Supports increasing cabinet density
  • Increases existing cooling unit capacity
  • Reduces the need to purchase additional cooling units
  • Improves IT equipment reliability and extends equipment life
  • Simple snap in place, installation saves time and labor and requires no downtime
  • Round grommets enable hole saw installation
  • Cost-effective tool for cable separation and cable management while minimizing bypass airflow in the rack
  • Durable ABS frame and Hybrid Brush sealing surface can be used for years
  • Hybrid Brush Technology (HBT) provides the most effective air seal in the industry and avoids sagging bristles

Product Documentation

Data Sheet fort 4" Rack Mount Grommet 

Installation Guide for 4" Rack Mount Grommet 

Fire Rating & Compliance

Fire Rating: UL94HB

Compliance: Yes


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