Tightness Class "D" with screws for ventilation ducts

Tightness Class "D" according to PN-EN 12237 is preserved when the following steps are followed:

• Fittings have EPDM rubber seals  
• The system of ducts and fittings has been tested with respect to the standard EN-12237
• SPIRO duct is properly cleaned of swarfs after cutting
• The screws are screwed alternately from opposite sides
  
• Screws have the tip of the drill smaller than the thread - that is WGO-D
  

 Tightness class "D" guarantees TALT butyl tape. Especially useful for sealing the installation of roof ends.

Information about classes tightness ducts and fittings can be found in the Knowledge Base.

More information about the sealing elements can be found in the PRODUCTS section.