Water pumps too loud - building a soundproof box - ventilation needed?

Since we’re talking pumps. I am using the DCT-6000 for my secondary system – it’s nearly silent and handles up to 1585 gallons per hour (just under 6000 liters per hour). Hard to beat $90, the only issue I had was the pump is BSPT so I had to find specific adapters to get the threads to match perfectly.

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