Manufactured Housing Floor Vents/Registers

In older manufactured structures the typical sizing of these vents were 4″x8″ – today’s newer models will typically be fitted with 4″x10″ floor vents. So – why the difference? Firstly, the industry is more mature and subsequently more technologically driven – Secondly, and perhaps just as importantly – a formula that takes into consideration the principle that air pressure is dependent upon the size of available discharge face (surface area), or vent size (specifically the opening of the vent). HVAC systems applied to older homes were not as powerful as those applied in newer homes today. (See our article on static pressure to learn more about this design principle). Just like placing your thumb over the outlet of a garden hose increases water flow pressure – so too – smaller vent face results in increased air flow pressure.