the 'take-off' starting collar you bought for your stove needs to be cut before you install it. the 'tiger-teeth' bottom of the 'take-off' were made longer than usual to accomodate many types of sheet metal installation needs. use a pair of sheet metal shears and extend the teeth (v-area) up to the bottom of your hole cut. about 3/4" of the tooth should be left so you can bend it with your fingers to grab the inside of the hole in your stove & insure a tight starting collar fit, before you install the rest of the pipe.
here's a pic of how it should look once you've made the cuts.
you can also use a piece of sheet metal with 2 magnets to block the front distribution airway of the stove, so the heat goes up the pipe. experiment with you blockage though, so a portion of the heat still goes in the room your stove is installed.
best regards,
tom
