Doby Slide On Flange System
Specification

Application
The slide on flange system is used by sheet metal contractors to join together air conditioning, ventilation or extract ductwork. Unlike angle iron, which involves drilling the fixing holes and connecting with nuts and bolts, the contractor simply cuts the flange to the ductwork dimensions, fits purpose made corner pieces to form a frame, and fits this onto either end of the ductwork section by means of spot welding or riveting. The ductwork is then bolted together with a gasket between the flanges to make the joint airtight. This allows the completed ductwork system to transfer or extract air to the required location.

Features
Provides for rapid assembly of cross joints Tested and certified by BSRIA in accordance with the HVCA test procedures DW/TM1
Integral pocket with permanently flexible non
toxic sealant		 Suitable for HVCA specification Joint Ratings up to J6 and pressure classes A,B and C.
Available in standard Euro sizes of 20mm,
30mm and 40mm		 Full range of accessories to suit all sizes of
flange
Fully conforms to UK,HVCA specification
DW144 		Tested in accordance with USA requirements of SMACNA
Doby Profile

During the manufacturing process the sealant pocket is rolled into the profile and air tightness is ensured by the inclusion of non toxic sealant.
The corner is formed to enable the duct to pass underneath and into the integral sealant during assembly.
Design Specification

All rectangular ductwork cross joints shall be the Doby slide on flange type complete with captive sealant
pocket with integral permanently flexible non toxic sealant,consisting of a Galvanised MS profile and EZP
corner pieces.The appropriate size of flange shall be fitted to the ductwork as covered by the construction
tables 2 to 4 of specification DW144.Shall be independently tested to the procedures of BSRIA in accordance with HVCA specification DW/TM1 and as manufactured by Doby Verrolec.The flanges shall be fitted to the ductwork and assembled on site with the appropriate gasket all to the manufacturers instructions.
DW/TM1 TEST RESULTS
 Profile Joint Rating Pressure Class
A B C D
 EP120/11 J2
 EP120/11 J2
 EP130/11 J3
 EP130/11 J4
 EP140/11 J4
 EP130/11 J5*    
 EP140/11 J5*
 EP140/11 J6*
 
*denotes tie bar
As tested by BSRIA in accordance with HVCA specification DW/TM1 test procedures March 1996
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