Pellet stove out - coal stove in (channing III)

My 13 year old pellet stove's auger motor is going so it's time for new heat. I have decided either the Alaska channing III or Reading Lehigh. I am doing the installation myself and have a few questions.

1 - My pellet stove has a 4" rear double wall pipe for venting. (No chimney). I will be using a power vent on the new stove. Do I need to make the 4" hole on my house bigger?

2 - Can you bring air in from outside to feed the burn? If so, what size pipe does it need? I presently use a 2" flexible steel pipe for my pellet stove.

3 - Does the reading Lehigh have a blower option? I called the Reading company and they said no, but their brochure says it does have the option. My dealer thought it did but wasn't sure.

Thanks.

According to the local news, wood pellets are all but sold out from Binghamton to Syracuse. Nobody dared speculate on when new supplies would be coming. Good luck with the coal.
I'd have to believe your questions would be easy for your stove dealer.

I'd have to believe your questions would be easy for your stove dealer.

You would think so but 2 different dealers I've talked to have different answers or aren't sure.

Pellets were short over in my area also. I purchased a ton in September and 2 weeks later you couldn't find them anywhere.