My house had been sprayfoamed last year, and the soffit vents have been sealed which made the home much tighter, and the amount of fresh air in the house has been reduced considerably, requiring mechanical ventilation.
I'm in south florida, so humidity is a major concern. My plan has been to install as follows:
Ultra-Aire XT150H with filter removed, input side connected to Lennox Pure-Air. Lennox Pure-Air with ducts connected to both inside return, as well as a fresh-air vent from outside connected to a Honeywell EARD6 damper. I was planning on putting MERV8 filters at both the input from outside air as well as the source return to catch the large particulate matter and spare the HEPA filter in the Pure-Air.
The output side of the Ultra-Aire XT150H will be connected to dedicated ductwork to all bedrooms, living room, family room, dining room (no kitchen, bathrooms -- don't want positive pressure in areas with potentially low air quality).
This plan seems to make a lot of sense to me as it will have positive pressure in all living spaces with HEPA filtered outside air.
The system will not be connected to the existing HVAC system at all, and will be ducted into both zones of the house. The two zones are the main living space (with 3 bedrooms), and the master bedroom as a separate zone. The house is all one level.
The two questions are:
1) Sanity check on this build, does it make sense?
2) I will have a VisionPro IAQ controlling the system, as well as the main living space zone. I'd like to wire it up to have the fan in the XT150H constantly running, and have the DHUM leads hooked up to turn the XT150H compressor on and off, and the VENT leads hooked up to open or close the EARD6 damper. The idea behind this is to always have air circulating around the house to minimize hotspots, always have filters running, and always maintain positive pressure in the bedrooms. My concern is that having the fan constantly running will cause signifigant amounts of condensation on the coils to re-humidify.
Thanks in advance!