Product Description

A ventilation flat take-off is a special fitting designed to create a round duct branch from a flat surface. It is most often used to connect round ducts to rectangular ventilation trunks, ventilation equipment housings, or plenum box walls.

The flat base (flange) of the take-off is mounted onto the wall of the trunk, and the round spigot serves as the connection point for the standard round ventilation system.

Key Features and Options

• Universal Transition: Allows for an easy and airtight connection between two systems of different geometries (rectangular and round).
• Two Connection Types (Custom Order): We can manufacture take-offs with a "male" spigot (nipple, for insertion into a duct) or a "female" spigot (socket, for connection with a nipple).
• Airtightness Options: The standard version of the spigot is supplied with an EPDM rubber gasket for Class "D" airtightness. A version without a gasket can be manufactured upon request (to reduce cost).
• Simple Installation: The flat base is easily attached to the surface with self-tapping screws or rivets, providing a wide area for sealant application.

Available Diameters and Specifications

Material and Thickness (for all types):

• Material: Galvanized steel DX51+Z275. Stainless steel (AISI430, AISI304, AISI316), aluminum, and powder coating (according to RAL or RR catalogs) are available on request.
• Thickness: From 0.5 to 0.9 mm depending on the diameter.
• Certification: The products comply with CE, EN 1505:2000 and EN 1506:2007 standards.

Application and Installation Tips

• Preparation: An opening corresponding to the take-off's diameter must be cut into the flat surface (e.g., the wall of a rectangular duct).
• Base Sealing: Before installation, it is recommended to apply sealant around the perimeter of the take-off's base to ensure a tight fit against the surface.
• Fastening: The take-off is fixed to the surface using rivets or self-tapping metal screws.
• Connection: The spigot with its gasket is inserted airtightly into the duct. When ordering the version without a gasket, the spigot joint should be sealed with aluminum tape.

Custom Manufacturing and Flange Options

We offer two main variants of the spigot base, depending on installation requirements:

• Standard Spigot (with rolled flange): In this version, the width of the connecting flange (rolled edge) is approximately 8–10 mm. This is a compact solution suitable for flat surfaces and standard installation.
• Spigot on a Square Plate: To increase the contact area and fastening security, we can fabricate the round connector (nipple or female type) into a square metal plate.
  • Advantages: A wide plate allows for more secure fastening of the part (more space for rivets at the corners) and covers potential irregularities in the cut opening.
  • Materials Made to Order: In addition to galvanized steel, such plates can be manufactured from stainless steel, aluminium, or copper.

Availability and Ordering

• In Stock: Standard flat surface spigots (D-100…400) with a small flange are kept in stock.
• Made to Order: Manufacturing of spigots on square plates, as well as items made of copper, aluminium, or stainless steel, is performed upon individual request within a short time.