KMM Covering/Protection Grille

Categories Air Diffusion, Grilles and Vents

KMM Covering/Protection Grille

A protective grille made from expanded metal, designed to cover the ends of ducts or wall openings. Its primary function is to prevent large objects from entering the ventilation system while allowing airflow.

Product Description

Key Features & Benefits

Protective Function
Primarily used to cover and protect open duct ends and wall openings, preventing entry of objects.
High Free Area
Features an effective open area of 78%, minimizing airflow restriction while providing protection.
Simple Screw Fixing
Attaches directly to duct ends or walls using standard screws (6.3 x 16 mm), enabling easy on-site installation.
Two Main Designs
1. With flanges for duct ends.
2. With frame & flanges for wall installation (supplied as one unit).
Robust Steel Construction
Made from steel sheet (Material Class 11) with a durable painted coating for longevity.

Technical Specifications

Design & Stiffening

Available in various sizes. Grilles with dimension A ≥ 800 mm include a central stiffening belt for rigidity.

Surface Finish

Standard painted finish: RAL 9010 (White).
Options: RAL 9001 (Cream), RAL 9006 (Aluminium).
Custom RAL on request.

Pressure Loss Coefficients

For sizing calculations.
Inlet (ζ): 2.2 (A≤630) / 2.4 (A≥800).
Outlet (ζ): 1.5 (A≤630) / 1.7 (A≥800).

Material & Assembly

Panels: Expanded (tensile) metal.
Frames/Flanges: Steel sheet. Requires on-site notching & bending of duct ends.

Installation & Control

Duct Preparation

For free duct ends: notch corners to depth "C" and bend flaps; corners remain open to accept the grille flange.

Fixing Method

Grille is screwed directly to the prepared duct end or wall frame using EN ISO 1481 screws (6.3x16mm).

For Wall Installation

Use the "with frame" design. The complete unit (grille + frame) is fitted into the wall opening.

Installation Note

Cutting, notching, bending, and final assembly are performed on-site during installation.