Moving biomass boilers into cellar

[Stewartt19]

Hello!
We have recently purchased a large Victorian farmhouse which has two biomass boilers housed in an outbuilding. As part of the sale agreement we are obliged to try and move the boilers into the main house so that the vendors can buy back the 'boiler house'. The 'boiler house' is a single garage which were not fussed about keeping anyways so no drama there. We have a hopefully suitable location, our cellar, the cellar was once the kitchen for the house so it has a large fireplace which again I'm hoping would be suitable for the flues. The room above the old kitchen currently has a small biomass heater which utilises the existing chimney for its flue.
My question is. Can I relocate the boilers into the cellar? I work with a guy who used to install biomass heating systems and when I spoke to him about this he spoke a lot about air flow and advantageous air. To say the least I'm confused. I've read a lot about people installing their systems in basements/cellars and this guy is telling me I probably won't have enough air flow. Does anyone have any experience of this?
We aren't actually in the house yet so not sure of the make and model etc so just trying to get an understanding of what we can possibly do.

Thanks in advance.
Stew