This 20 limitation applies to the minimum 30 height only low clearance attics.
A c attic clearance.
I ve seen new construction where you have to monkey over a huge return air duct to try to get to the furnace.
So why put an hvac system up in the attic at all.
In addition to making the unit hard to get to for service high attic heat can trigger the high.
Measured along the center line between the attic access opening and the attic furnace.
Like with any building codes check with your local building department if any or all of the following requirements apply in your jurisdiction.
If you currently reach the attic by means of a hatchway or pull down stairs then you will need to carve out space for a length of permanent stairs several square feet in the attic and on the next.
Put it in an attic full of blown insulation and you re forcing it to work harder to vent its heat.
Make sure that 24 walkway is level and unimpeded as much as possible from the attic entrance to the mech.
Make sure you accurately measure your opening size floor to ceiling height as well as swing clearance and landing space so you select a ladder that will fit the space you have.
Attic air conditioner drip pan installation falls under the irc international residential code and umc uniform mechanical code regulations.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
Because an attic ladder goes into your ceiling it s important to make sure that your ceiling and surrounding area are appropriate for the ladder you are considering.
Well mainly it s a way to save space.
This opening must provide clear access of at least 20 by 30.
Receptacle no further than 25 feet from unit.
Attic hvac systems save space.
Attics containing mechanical equipment such as an air conditioner require an access opening regardless of the size of the attic itself.
Even if you don t like rules make that attic air conditioner drip pan.
Unfortunately the problem with lofts is that they tend to get neglected and this can build up to it being full of items that you no longer need or require.