*PLUMBERSSTOCK EXPERT* responded:
Hi! We are glad to know about your interest in our M&G DuraVent 3085 3" Pellet Vent Horizontal Cap. According to M&G DuraVent, this M&G DuraVent 3085 can't be used vertically. For more information, you may want to check page 1 of this Information Sheet . If you want to use a vertical cap, you will need the M&G DuraVent 3080 Pellet Vent Vertical Cap. This product is not yet posted on our website but uploading of information is ongoing. Just have the product number ready and call one of our customer support specialists at 435-868-4020 or send a message by pressing the "Contact Us" tab found on the bottom right part of your screen. Happy shopping!