How are you going to heat and cool that 1200 CFM? Because you are removing all the air in the home every 25 minutes, and bringing in outside, unconditioned air.

The Bluestar 60” has enough BTUs that a 1200 CFM fan is required.

They said they have a heater to temper the air.

Hire an experienced installer. If this turn's out unsatisfactory it's on you because installer only did what you told them to do and how it should be done. Are you the builder or have you hire one?

Forced make-up air systems are uncommon in our area. You'd have a problem finding an experienced installer. There's nothing wrong with collaborating with your installer to ensure it's done correctly the first time. Fantech makes attractive make-up air supply grills. Check with them about the size required and recommended placement.

A 60” range needs much more than 1100 CFM. So the ventilation issue is even larger and more expensive than you think it is. Yes, you require *heated and cooled* MUA. Both. And that system is going to cost more than the range, even if a commercial restaurant HVAC company does it. Which it should. After all, you are putting in more BTU than even a typical small restaurant uses. Better also upsize the gas line. Or it may never work right.

@klem,

We've installed a lot of residential kitchen MUA systems both in new custom home construction and for kitchen remodels. The vast majority are passive systems (i.e., no fan to force air flow.) I think we've only installed two forced-air MUA systems to date. In our area, they are indeed uncommon.

While commercial HVAC contractors may be familiar with commercial code requirements, commercial equipment, and commercial customers, the OP's need is for a residential MUA system. Most residential HVAC contractors are pretty clueless when it comes to ventilation systems. In my area, most residential HVAC contractors don't know what an ERV is, let alone a forced MUA system. If commercial contractors in your area will do residential work, then hire them.

Here's a very good video on the subject using Fantech (sponsored by Fantech) products. The presenter describes the purpose of MUA and demonstrates both passive and active MUA systems.

Zumi: "How are you going to heat and cool that 1200 CFM?"

You can incorporate a heater as described here.

We have forced MUA with a vent in the ceiling. (We have a 36” bluestar RNB built for propane) It bothered me at first because it looked so utilitarian, like a bathroom fan or something, but then we painted it the same color as the ceiling (which is sherwin Williams Alabaster in our case) and now it blends right in and I never even notice it anymore. As a side note, we did not opt for heating or cooling the MUA because of where we live. We don’t even have an HVAC system.