Hot tip for all you guys with smaller bagless vacs... use the whole-house vac to empty the canister on your smaller units... that way you minimize dealing with all the dust... you do it less frequently when you empty the WHV.
That why I loveeeeeee old model homes they're build to last for generations compare to today garage particle subdivision crappyyyy build homes..I would've purchase that house in a heart beat.
13' of pipe in that fitting combination, 1 sweep tee would have done the job at only 4'. Not just blowing smoke , 45 years experience installing and servicing central vac systems.