Check whether a new partition layout is proposed which will split an existing external window and so affect the design of the secondary windows.
When treating existing ribbon windows long multi panelled secondary sliding units with the minimum number of mullion points will reduce initial costs but modifications to accommodate subsequent partition changes could be expensive.
Regular mullion points will increase partition flexibility. The mullions can be wide faced to accept a standard partition (see 'Coupling Details') or special closers can be introduced for narrow mullions, but the design must allow access to any handles or finger pulls. These closers are unlikely to be as acoustically efficient as the main partition.
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Guidance