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, , <br /> of pipe into the female end un61 the <br /> bcking lugs are covered.Twist the <br /> female end dockwise an eighth of a <br /> tum to iock secti�s together(Fig. 5). <br /> Screws are not required to secure the <br /> joint, but are acxeptable provided they <br /> do not penetrate the inner wall of the �i <br /> vent pipe. <br /> (2) Horizontal runs of vent pipe <br /> must be suppcuted to prevent any <br /> downward sags. Horizontal pipe <br /> sections should be supported at least <br /> every 4feet.Wall Straps can be <br /> used for this purpose.Altematively, Figure 4 <br /> plumbers tape or other suitable <br /> r�combustible material can be used <br /> to support the vent pipe. <br /> (3) DirectVent Pro venting requires no <br /> sealant, unless speafically required by <br /> appliance manufac�urer. � .... �� <br /> Step 3. With the Appliance Adaptor �� � �scr�ws <br /> and Pipe Section attached to tfie . . <br /> appliance, slide the a�liance irrto its <br /> correct location, and mark the walt �-- <br /> for a square hole of the appropriate F� ` <br /> siie_ Refer to Table 1,page 8 for °VD <br /> U�e comect size square o�ing Fi�re 5 <br /> unless othervvise speafied by the <br /> appliance manufadurer's ctearance <br /> requirements.The centerline of the �� <br /> pipe should line up with the center <br /> of the square hole(Fig. 6). Cut <br /> and frame the square hde in the <br /> exterior wall where tl�e vent will <br /> be terminated.A Wall Thimble or 4 <br /> Wall Fresfiop may be rec�ired by the <br /> �pliar�ce manuFaduref as adc�tion� <br /> thertn�prot�tion f�the wall. If the <br /> wall beirx�penetrated is cortstructed <br /> aF noncombustible material only.i.e. <br /> masonry bbdc,bridc,or concrete only, <br /> a hde with zero dearance to the vent Fi�re 6 <br /> 7 <br />