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  • Users: emalsyd
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  1. emalsyd

    Corroding pool ductwork

    Last year we installed new underground pool duct at a long-time customers residence. Pool is indoors, at the same time we installed a new Seresco dehumification unit. Pool is salt water vs chlorine. The main underground duct was PCD coated spiral. Branch duct up to the floor grilles was...
  2. emalsyd

    Air Changes an Hour Confusion

    We are doing some work at a small private school. They've asked us to go through the school and determine the ACH in each classroom and if they are getting the required 4-6 ACH as suggested by the CDC based on the new Covid Requirements for schools. The document they gave us lays out the...
  3. emalsyd

    Kitchen MUA heat calc

    Looked a small restaurant kitchen yesterday. The MUA is provided by a un-tempered supply fan directly into the front of the hood so the MUA blows into the hood. The owner wants to add cooling to the kitchen. Do I have to take the MUA into my calculations or is it negated since it goes right...
  4. emalsyd

    Soldering lab ventilation

    A local tech academy we do some work for ask us to provide a rough budget price for a new soldering/brazing lab they are thinking of installing in the future. We're an HVAC contractor. They will end up hiring an engineer but were just looking for some rough numbers to get into their budget...
  5. emalsyd

    Kitchen Hood Exhaust Insulation

    I'm installing a welded 16ga black iron duct for a commercial kitchen hood. Do I need to insulate the duct with firewrap. Wanted to make sure I'm reading the mechanical code correctly. 506.3. Grease duct clearances: Where enclosures are not required, grease duct systems and exhaust equipment...
  6. emalsyd

    Is Make up Air required in a kitchen

    A local boys & girls club is installing a small kitchen area. They are adding a 6 burner stovetop and a 4'x4' hood above. Exhaust is 1125 cfm. Is a MUA unit required or can they take in transfer air from the adjoining 4000sq ft activities room. The activities room is served by a rooftop unit...
  7. emalsyd

    Concentric diffusers box

    Just got hired to install the HVAC at a arcade/gaming facility. The engineer designed most of the rooftop units to utilize concentric diffusers. The owner let the engineer go a while back so I don't have him to ask. Took a walkthrough of the facility today. Most areas are 21' to the roof...
  8. emalsyd

    Fire pump room ventilation

    Does a fire pump room with an electric fire pump require ventilation. I can find ventilation requirements if using a diesel or gas powered fire pump but can't find anything for an electric fire pump. I wouldn't think any would be required since there is no combustion happening.
  9. emalsyd

    Maximum temp. in data closet

    Is there any way to predict what the temperature in a small data closet would get to if we didn't install any mechanical cooling? We have a 6'x4' internal room on the first floor, conditioned rooms above. The owner is saying the btu load of the equipment is 11,800 btu and the max temperature...
  10. emalsyd

    Class B Operating Room

    I need to design a Class B Operation Room. Supposed to have 20 ACH with 4 outdoor ACH, no recirculating room unit. I'm assuming by no recirculating room unit the unit needs to be 100% outdoor air. The 20 ACH with 4 OACH is throwing me off. If I'm 100% outdoor air wouldn't my outdoor ACH by...
  11. emalsyd

    Fume Hood Fan Sizing

    I was called by a customer. They had someone hook up their conventional fume hood and it isn't passing certification. The certifier said he needs to get 500 cfm when the sash is open 18" and 350 cfm when the sash is at 12". Exhaust duct is 10" round. Trying to find out how to size a new fan...
  12. emalsyd

    Calculating negative pressure

    Is there a calculation to determine how much exhaust is needed in a space to get a desired negative pressure. We have a room with 1200 supply cfm. They are looking for the room to always be a minimum of .01 wc negative. Need to determine how much cfm to exhaust.
  13. emalsyd

    ISO Class 7 room

    We are working in a chemotherpay pharmacy which is going to contain to CACI isloators where the chemo drugs are mixed. The owner sent me a brief description of USP 797. It states the CACI islolators need be be installed in an ISO Class 7 room. We are planning on installing fan powered HEPA...
  14. emalsyd

    Coil pressure drop

    I'm trying to figure out the actual water pressure drop on a hydronic coil. I have the design gpm, actual gpm, design water pressure drop. Is there a formula to figure out the actual water pressure drop?
  15. emalsyd

    Calculation Coil Pressure Drop

    Trying to balance some hydronic coils. I have the design gpm, actual gpm and design water pressure drop. Is there a formula to calculate the actual pressure drop?
  16. emalsyd

    Spinning class cooling load

    A local YMCA wants to add cooling to 14' x 28' room they use for spin class. There are 15 bikes in the room. What would be the heat load from each person cycling. I'm using Trane Load 700 to calculate how much cooling they will need but I'm not sure what the load of the spinners would be?
  17. emalsyd

    Bowling Alley Cooling

    We have been brought in to look at the existing mechanical system in a bowling alley. I'm working the heating/cooling loads for the bowling areas. Each area is 12,300 sq. ft. Minimal to no insulation in each area. The north lanes load is 32 ton, south is 34 tons. Since all of the people &...
  18. emalsyd

    Ductless splits in Gymnasium

    I was looking at a school gymnasium which currently has an air handler w/hot water coil serving the gym. The existing duct is sized to handle about 5000 cfm. The supply duct is located above the ceiling with ceiling diffusers. The return drops down to the floor level. The cooling load for...
  19. emalsyd

    friction loss per 150' of duct

    i'm trying to size ductwork based on a total run of 150'. is there a formula to determine duct sizing or some way to convert the duct sizing on a ductulator to handle the friction loss for 150' vs. the standard 100'?

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