Airflow, Rheia says 10-12 vents per ton. 400+ cfm per ton is tolerable by most manufacturers. So at 100' equivalent length(not nearly as far as you would think), at a static of .10 which is a good target with a low restriction central return air nets you 20 cfm per vent. So, not accurate Rheia. Youll need 20 vents per ton. Now, going to 4" you do a lot better, 40 cfm per vent. So 10-12 per ton. Thays assuming not a lot of duct length. On a multi story setup, its easy for length to easily go over 200' in a flash, if not 300' Now, builders, especially cheap ones that this has attracted love their 2x4 walls. So 3" is the standby, because 4" wont work in a 2x4 wall. Rheia would have been best to bail the 4" sku's and focus on 5", which would fit in a 2x6 wall. Now that would deliver 65-70 cfm per run at 100', 6 vents per ton....and fit inside walls with their uninsilated flex. Most designers are going to struggle with actual true length runout calcs, and with these small sizes, Rheia is going to have issues on their hands. Not enough vents, not enough availabke usable static, and there are going to be a lot of unhappy people.
Its going to be terrible. I've been designing and installing creative HVAC solutions for 3 decades throughout the western states. Someone at Rheia just cant do math. This manufacturer is selling a extremely flawed bill of goods. National production builders have bought into this system and its going to fail. The math is simple. I assume this is likely around a 3 ton system, I don't see it being much smaller. So, on a 3 ton setup, a HVAC contractor would have a minimum of three 10" rounds, worst case, the equivalent of three 12" rounds. About between 235 and 300 sq inches coming off of the main plenum. Then typically, that would run out into 10-14 6" vents, or in many cases, we run less vents in a room, a single room with a 8", in that case, a 3 ton setup could run 6 or 7 vents total. With 10 6" vents, on the small end (which helps Rheia look better), we have 282 sq inches total in final vent locations. With a surface area of 188 linear inches of diameter between those ten 6" runs. The Rheia, has 3" vents. 9.5" per vent in circumference that offers 7" of cross sectional area. In this case, multiply all that times 23. 161 sq inches of area for air to pass through, passing over 219 sq inches of surface area. So, Looks like this duct system is only good for 2 tons if that (equivalent of a single 10x16 rectangular duct), yet is has significantly more surface area than a typical 3 ton setup. You can see where this math is going. If this system had the proper crossectional area enough for a 3 ton, you would need about vents to get to 200 sq inches (about a 16" round). Yet 30 small 3" ducts yield 285 area of circumference. Yet a 16" round yields 50 sq inches. we are talking 600% difference. Anyone just do the math. This is going to lead to some bad things nationally.
@@jonesmechanical I recently bought a new construction house with more standard HVAC because I was terrified of the long term costs of a house that had this Rheia system paired with a Lennox VRF heat pump and an $800 communicating thermostat. I think some home builders are starting their own HVAC company knowing there is a huge payoff when these systems die.
I started as an apprentice a little over a year ago out here in IDAHO. just found your channel and I think you make a rough-in look super fun lol. How has the housing market affected your work? Appreciate the videos.
Bro, just found your channel. Is there any chance your located in Nevada? Just bought an old house built in 1948 and I want to add a hvac system (heating/cooling). The house has a crawl space like maybe 4ft height and it has some attic space but no space in the house for mechanical room. What would you suggest for such a house? I’m willing to pay for consultation. If you were in Reno Nevada, I would have just hired you for the job. Thanks
Yes I do. Are you able to fly into Nevada to install hvac? I can put you in hotel and buy whatever you need. I wish you had an email or website where I can contact you.
Odds are, trusting Rheia with 10-12 vents per ton at 3" sizes, unless you are air conditioning a small dog house, it's complete fail. 4" has a fighting chance, but still on the brink of failire at 10-12 vents per ton.
Bro i have changed my field into freelancing mep hvac design which i had studied extensively with certifications now i don't know how to start my journey as online engineer - like what skills are most sellable in market demand like making revit, autocad drawings drafting or designs, project calculations in ms excel with boq to make profit ? What's better hvac site, design or revit design or total mep work.. What should i start with & how to complete the given work properly could you help me with it in some details...
It's not suprising. It's just math. And these smaller sizes, and very vague 10-12 vents per ton recommendation, most hvac guys don't do math, let's be honest, that's the problem with everything today, people don't critically think and this product is trying to cater to builders and hvac guys who don't think. Can it work, absolutely, but it won't be a packaging dream like they are even showing here on these videos. All the videos I see on RUclips are all 3" sizes, and unless you have at least 40 vents on a 2 ton, at least 60 vents on a 3 ton, 80 vents on a 4 ton, and 100 vents on a 5 ton, its going to fail, even at that, that's assuming short runs. 4" is better, but still. All the math has to be done. And if you smart enough to do the math, you'll quickly figure out your better off packaging a normal system, avoiding this, and saving builders and homeowners a system that doesn't do anything well. Including packaging it nicely. This will go by the way of others that have tried this. Keep it to manufactured homes, every home the same size, and duct length, all predictable.
Airflow, Rheia says 10-12 vents per ton. 400+ cfm per ton is tolerable by most manufacturers. So at 100' equivalent length(not nearly as far as you would think), at a static of .10 which is a good target with a low restriction central return air nets you 20 cfm per vent. So, not accurate Rheia. Youll need 20 vents per ton. Now, going to 4" you do a lot better, 40 cfm per vent. So 10-12 per ton. Thays assuming not a lot of duct length. On a multi story setup, its easy for length to easily go over 200' in a flash, if not 300'
Now, builders, especially cheap ones that this has attracted love their 2x4 walls. So 3" is the standby, because 4" wont work in a 2x4 wall.
Rheia would have been best to bail the 4" sku's and focus on 5", which would fit in a 2x6 wall. Now that would deliver 65-70 cfm per run at 100', 6 vents per ton....and fit inside walls with their uninsilated flex.
Most designers are going to struggle with actual true length runout calcs, and with these small sizes, Rheia is going to have issues on their hands. Not enough vents, not enough availabke usable static, and there are going to be a lot of unhappy people.
Bro, well done!!! Super impressive young man!
Man, I remember back in the 1900's, When I could still run panned return bays.
It would be cool to see this done on existing construction.
Wheres all the videos at ? Johnny must have lots to say lol. Great stuff......feed us
Beautiful work bud lol
Very nice work, I’ve never seen this ducting system, how is the static pressure on a system like this?
Yes very curious to see static readings with all those small supply vents
Its going to be terrible. I've been designing and installing creative HVAC solutions for 3 decades throughout the western states. Someone at Rheia just cant do math. This manufacturer is selling a extremely flawed bill of goods. National production builders have bought into this system and its going to fail. The math is simple. I assume this is likely around a 3 ton system, I don't see it being much smaller.
So, on a 3 ton setup, a HVAC contractor would have a minimum of three 10" rounds, worst case, the equivalent of three 12" rounds. About between 235 and 300 sq inches coming off of the main plenum. Then typically, that would run out into 10-14 6" vents, or in many cases, we run less vents in a room, a single room with a 8", in that case, a 3 ton setup could run 6 or 7 vents total. With 10 6" vents, on the small end (which helps Rheia look better), we have 282 sq inches total in final vent locations. With a surface area of 188 linear inches of diameter between those ten 6" runs.
The Rheia, has 3" vents. 9.5" per vent in circumference that offers 7" of cross sectional area. In this case, multiply all that times 23. 161 sq inches of area for air to pass through, passing over 219 sq inches of surface area. So, Looks like this duct system is only good for 2 tons if that (equivalent of a single 10x16 rectangular duct), yet is has significantly more surface area than a typical 3 ton setup.
You can see where this math is going. If this system had the proper crossectional area enough for a 3 ton, you would need about vents to get to 200 sq inches (about a 16" round). Yet 30 small 3" ducts yield 285 area of circumference. Yet a 16" round yields 50 sq inches. we are talking 600% difference. Anyone just do the math. This is going to lead to some bad things nationally.
@@jonesmechanical I recently bought a new construction house with more standard HVAC because I was terrified of the long term costs of a house that had this Rheia system paired with a Lennox VRF heat pump and an $800 communicating thermostat. I think some home builders are starting their own HVAC company knowing there is a huge payoff when these systems die.
Are you still doing videos
I started as an apprentice a little over a year ago out here in IDAHO. just found your channel and I think you make a rough-in look super fun lol. How has the housing market affected your work? Appreciate the videos.
@sammy Martinez I appreciate the comment bro we try to make it a good day we do this everyday it’s best that we make it fun! How do you like roughin?
Bro, just found your channel. Is there any chance your located in Nevada? Just bought an old house built in 1948 and I want to add a hvac system (heating/cooling). The house has a crawl space like maybe 4ft height and it has some attic space but no space in the house for mechanical room. What would you suggest for such a house? I’m willing to pay for consultation. If you were in Reno Nevada, I would have just hired you for the job. Thanks
@dialac1 Bro sorry for the late reply I’m located in Utah. Did you still need some help with your house?
Yes I do. Are you able to fly into Nevada to install hvac? I can put you in hotel and buy whatever you need. I wish you had an email or website where I can contact you.
ive never seem that type of duct design!!
What happened no more new videos?
crazy... never seen this in my area of the world
Hey bro. How is the airflow?
Odds are, trusting Rheia with 10-12 vents per ton at 3" sizes, unless you are air conditioning a small dog house, it's complete fail. 4" has a fighting chance, but still on the brink of failire at 10-12 vents per ton.
Looks like the old space pak system
Bro i have changed my field into freelancing mep hvac design which i had studied extensively with certifications now i don't know how to start my journey as online engineer - like what skills are most sellable in market demand like making revit, autocad drawings drafting or designs, project calculations in ms excel with boq to make profit ? What's better hvac site, design or revit design or total mep work.. What should i start with & how to complete the given work properly could you help me with it in some details...
Great job! Nice work
The system sucks. It was installed in our new construction and builder has switched half way through community.
Thats what you see in older fifth wheel RV's.
It's not suprising. It's just math. And these smaller sizes, and very vague 10-12 vents per ton recommendation, most hvac guys don't do math, let's be honest, that's the problem with everything today, people don't critically think and this product is trying to cater to builders and hvac guys who don't think.
Can it work, absolutely, but it won't be a packaging dream like they are even showing here on these videos.
All the videos I see on RUclips are all 3" sizes, and unless you have at least 40 vents on a 2 ton, at least 60 vents on a 3 ton, 80 vents on a 4 ton, and 100 vents on a 5 ton, its going to fail, even at that, that's assuming short runs. 4" is better, but still. All the math has to be done. And if you smart enough to do the math, you'll quickly figure out your better off packaging a normal system, avoiding this, and saving builders and homeowners a system that doesn't do anything well. Including packaging it nicely. This will go by the way of others that have tried this. Keep it to manufactured homes, every home the same size, and duct length, all predictable.
No more videos
those dont seem super insulated?
@scott schweigert no they are not insulated they in a conditioned space
You're by far smarter than me at this but let me school you it's for your longevity be a wise man get a dolly