If you have a 600 Watt HPS lamp, the BTUs for that luminaire are the same as a 600 Watt LED. A single watt of power is equal to 3.41 BTUs so a 600W luminaire will produce 2,046 BTUs
x4 that's 8k BTUs of heat to shift
The general recommendation (from what I found on a quick google search) is 3k-4k BTU's of cooling per 1k of heat, so you will need 24000-32000BTU's of cooling to remove that heat.
Without dimming or using less lights you are going to struggle removing that amount of heat with a single extraction fan. Adding a carbon filter to the fan can cut its efficiency by upto 50%, something to remember when speccing fans for a grow room.
The smscom may or may not help with the humming, it will be a buy/borrow one and try it to see. Buy somewhere like amazon with a good return policy and if it doesn't work you can send it back for a full refund or if it does work send it back anyway and buy one from somewhere cheaper
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