Post joists?

[junglejim]

My posi joists are joined with cross members like the attached. I’m wondering if can drill through those or take out to run MVHR ducting along the length? The open web is great for running across the building but I also need to go parallel to joists. Any advice appreciated

 thank you

[crispy_wafer]

I’d get in touch with the supplier, they should be helpful in advising your options with your specific joist layout/size/depth..

[Tony L]

The posi joist mfrs call those "cross members" strongbacks.

[Gone West]

I had a similar problem at my last self build. I cut out the section of strongback, where I needed access and replaced it with a noggin top and bottom between the metal web joist flanges.

[Oz07]

I've also cut sections out before and noggin between