36  Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721 
 
Figure 18:  3 ft × 3 ft (915 mm × 915 mm) hood and frame. The support poles always cross as pairs 
at the front and back of the fabric hood. For the 3 ft 
× 3 ft (915 mm × 915 mm), the support poles 
are inserted into the outside ferrule locations. 
 
 
Figure 19:  Frame Corner Assembly 
 
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