It is nothing that can be touched without an engineer's approval.

If they support the roof, they're a truss. If they support the floor or ceiling, they're a joist.

@HU-791729054 , absolutely agreed. Are these “open web” design?

@HU-867564120 , thank you for explaining. Are you able to identify if these are “open web” trusses? Thanks.

Or “open web” joists?

Honestly, I can't tell a thing from your pictures. What are they supporting? Roof, ceiling or floor?

@HU-867564120 these are supporting the roof and it is then to be covered by sheetrock.

Some would call them a parallel cord truss.

Yes

WHY do you want to know is the better question. They support your roof, and they are engineered. They cannot be modified.

@HU-791729054 Great question! I am asking because this room is not getting any AC nor Heat (NONE) from the HVAC system. Not sure if it is due to the tight angle that the flex duct is turning to connect to the vent due to the truss spacing.

Further to the left (not shown in photo), there is another vent parallel to this here. Also with NO air flow coming out.

The Plan listed open web trusses so I am posting and asking what type of trusses these are if it is not open web.

These photos were taken during the build stage and may help reveal what could be causing the no air issue and what can be done to correct it.

The house is already completed.

Any suggestions on how to get air to run into this room without touching the trusses? The hvac system is sitting outside of the room in the hallway. There are 2 turns requiring close to 90 degrees turns to get to this room.

" These photos were taken during the build stage and may help reveal what could be causing the no air issue and what can be done to correct it. "

From what I can tell these pictures and your description tell us nothing. You need to get your HVAC guy out to the house.

Is it really getting no air at all, or just very little. If no air, I would guess the ducting may have separated at one of the joints so the air is blowing into the space above the ceiling as opposed to making it all the way to the duct on the room. This is for your hvac contractor to troubleshoot and fix. If it is low flow, then it's likely because of pinch points of how they had to run the ducting.

I'd like to add that flexible duct is used by hacks in HVAC work. For one, the ducts restrict flow even when run straight, secondly they're subject to damage by rodents and workmen and third, they don't bend around corners or through tight spots without restricting flow. I'd encourage your GC to remove the drywall ceiling and figure out the problem.

This what open web trusses and rigid ducts look like.