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Apprentice Q&A · #192

The RTU ordered was a down-discharge, but the curb was framed for side-discharge. How do I build a transition inside the curb?

4th YearAdvanced Problem SolvingRED · Stop / Verify

If you cannot halt the crane lift, you must fabricate a heavy-duty, internal sheet metal blank-off panning floor plate to completely seal off the original open bottom vertical drop tracks inside the curb cavity. * Cut out precise new horizontal exit penetrations through the side walls of the curb structure framework, and build a set of radius short-radius throat transition elbows that connect the bottom discharge openings of the unit out through the side wall penetrations. Ensure everything is t

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Plain-English answer

If you cannot halt the crane lift, you must fabricate a heavy-duty, internal sheet metal blank-off panning floor plate to completely seal off the original open bottom vertical drop tracks inside the curb cavity. * Cut out precise new horizontal exit penetrations through the side walls of the curb structure framework, and build a set of radius short-radius throat transition elbows that connect the bottom discharge openings of the unit out through the side wall penetrations. Ensure everything is thoroughly sealed with heavy-duty weatherproof outdoor mastic and flashing tape.

Field checklist

Ask Foreman

Hey boss, I’m on advanced problem solving and need verification before I touch this: The RTU ordered was a down-discharge, but the curb was framed for side-discharge. How do I build a transition inside the curb? Do you want me to stop here and check the approved detail, submittal, or inspector/manufacturer requirement first?

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Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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