I wish I could say exactly where this is! Is it on the west side of Yonge St?

It looks like the crew rebuilding the drainage/ventilation for the Lawrence station platform have finished their work on Wanless Av at Yonge and could re-open the intersection quite soon. I wonder if this vent was louder before the new ventilation opened up? (i.e. is it quieter now?)

The grill rattle is on the west side of Yonge just north of the big office building on the northwest corner of Yonge and Lawrence. The TTC vent is part of the access drive to parking under that building.

Thanks for your continued attention to the problem. Now let's forget it!