The Spirit VHF Series Oil Furnaces (VHF-ABP, VHF-ACP, VHF-ABT, VHF-ACT) are low-profile highboy upflow furnaces with the blower located beneath the heat exchanger.
They are designed to fit nicely in your low ceiling basement since a low-profile design is typically shorter than a highboy furnace.
The Spirit VH8 Series Oil Furnaces are designed for those larger installations with outputs from 101,000 to 32,000 BTUH.
The Spirit VL8 Series Oil Furnaces are designed for those larger installations with outputs from 101,000 to 132,000 BTUH. The blower is located in the back of the heat exchanger.
A lowboy is a shorter height furnace with a design typically used for basement installations with low-height restrictions.
The VL8FA119P60B is for front flue applications and the VL8RA119P60B is for rear flue applications.
The Spirit VL Series Oil Furnaces (VLF-DBP, VLF-DCP, VLR-DBP, VLR-DCP) are lowboy furnaces with the blower located in back of the heat exchanger.
A lowboy is a shorter height furnace with a design typically used for basement room installations with low-height restrictions.
Spirit VLF is for front flue applications and the VLR is for rear flue applications.
The Spirit VC Series Oil Furnaces (VC-CBP) are multi-position compact design furnaces, supporting all configurations, upflow, horizontal left or right and downflow.
This style furnace can be mounted horizontally where height restrictions are paramount. For instance in a basement crawl space.
Most furnaces draw cold air in at the bottom and warm air is released out the top. In certain situations, this is not practical and a counterflow or ("downflow") furnace is needed. In a counterflow furnace, cold air is drawn in from the top and warm air is released out the bottom.