The 50mm double throated louvre blade has a couple of features woth mentioning.

• The standard pitch of 50mm gives 44% air flow
• The 50mm louvres are fabricated as an insert unit that can be fitted into Series 50 and 51 doors as shown left.
• Jamb adaptor has inbuilt recess to accept birdwire if required.
• Blades fixed to jamb adaptor with stainless steel screws.