Advertisements
  • LED Grow Light for cannabis, HLG lighting, Percys Grow Room Ad
  • Ali Bongo, Head Shop UK, buy best bong UK, Percys Grow Room
  • Barneys Farm, Cannabis Seeds Store, Percys Grow room
Notifications
Clear all

Exhaust size

ThatNinjaWeed
(@thatninjaweed)
Terpinolene
New Member
Points: 61

Does anyone see a problem with running a 2 1/2 “ diameter exhaust?

this wouldnt be the size of the fan or ducting or anything just the size of a part i need to fit in my box

ive never heard of it so i wanna know..

At most the whole part is like 2” of 2 1/2 “ diameter the rest would be four

 

is there any reason i should just avoid this completely?

 

also if you know.. what kind of sealant is best to patch holes? Silicone?

can i use like asphault sealant (cones in a tube)

 

Thx

ReplyQuote
Topic starter Posted : October 15, 2020 1:02 am
monkeydo
(@monkeydo)
Valencene
Patreon Bling
1 Plant of the Month Win
10k Post Likes
25K Post Likes
Active Grow Diary Bling
5 Complete Grow Diaries
Chat Moderator Bling
The High Council Award
I Voted Award
Instagram Rep
Admin Bling
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
5k Post Likes
2 Plant of the Month Wins
OG
Points: 104714

If I’m reading this correctly, you want to reduce a 4 inch duct to 2.5 inches. If this is the intention it’s going to create some significant back pressure at full speeds. Dropping from 4 to 2.5 you end up with only 40% of flow capacity in the duct. If you go to 2 inch you are working with only 25% capacity. If you don’t need much flow it could work but it’s far from ideal in most applications. 

Random acts of kindness make the world a better place

ReplyQuote
Posted : October 15, 2020 3:31 am
ThatNinjaWeed
(@thatninjaweed)
Terpinolene
New Member
Points: 61

@monkeydo

its a small box - do you think the backflow will make it smell?

is it possible it may actually help the situation by require less of the fan? 

or are you sayin the air will actually go backwards back out the fan?

i dont really get it

ReplyQuote
Topic starter Posted : October 15, 2020 5:39 am
Zombie Nation
(@zn)
Valencene
1 Plant of the Month Win
10k Post Likes
5k Post Likes
Active Grow Diary Bling
1 Complete Grow Diary Award
The High Council Award
Sex Pot Grow Off
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
OG
Points: 100851

Am slightly confused but why does it have to be 2 1/2" from the box...a pic would maybe help 😉

As Monkey says above, you are asking for problems...airflow would be massively restricted and fan would be working overtime

And what hole size do you need to fill ?

ReplyQuote
Posted : October 15, 2020 5:50 am
ThatNinjaWeed
(@thatninjaweed)
Terpinolene
New Member
Points: 61

@zn

just because the hole is square and the screws are where they are..

ReplyQuote
Topic starter Posted : October 15, 2020 5:54 am
Zombie Nation
(@zn)
Valencene
1 Plant of the Month Win
10k Post Likes
5k Post Likes
Active Grow Diary Bling
1 Complete Grow Diary Award
The High Council Award
Sex Pot Grow Off
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
OG
Points: 100851
Posted by: @thatninjaweed

@zn

just because the hole is square and the screws are where they are..

Is it a box fan or a homemade box around a normal fan ?

Can you not enlarge the 2 1/2" hole to 4 or 5"

 

ReplyQuote
Posted : October 15, 2020 5:58 am
monkeydo liked
jacks_farm
(@jacks_farm)
Linalool
100 Post Likes
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
Known Member
Points: 8501

thats a great ideal if it's a square 4" fan 

ReplyQuote
Posted : October 15, 2020 6:50 am
Zombie Nation
(@zn)
Valencene
1 Plant of the Month Win
10k Post Likes
5k Post Likes
Active Grow Diary Bling
1 Complete Grow Diary Award
The High Council Award
Sex Pot Grow Off
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
OG
Points: 100851
Posted by: @jacks_farm

thats a great ideal if it's a square 4" fan 

Never seen a square fan Grin

 

 

ReplyQuote
Posted : October 15, 2020 6:58 am
jacks_farm
(@jacks_farm)
Linalool
100 Post Likes
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
Known Member
Points: 8501
Posted by: @zn
Posted by: @jacks_farm

thats a great ideal if it's a square 4" fan 

Never seen a square fan Grin

 

 

I stripped a large server room down a few years back and ended up with about 20 240v 4"pc (18w, 12w) fans and they are great (pc fans say there 4" but the fan blades are about 3" across) 

you can use a fan controller to reduce the noise and they slide in a square 1ltr pot so I can use 5"/6" ducting and use it as an extraction fan 

great for a small veg room or a box to dry the bud in, have the ducting going into the flower room so there no oder 

 

ReplyQuote
Posted : October 15, 2020 8:01 am
Zombie Nation
(@zn)
Valencene
1 Plant of the Month Win
10k Post Likes
5k Post Likes
Active Grow Diary Bling
1 Complete Grow Diary Award
The High Council Award
Sex Pot Grow Off
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
OG
Points: 100851
Posted by: @jacks_farm
Posted by: @zn
Posted by: @jacks_farm

thats a great ideal if it's a square 4" fan 

Never seen a square fan Grin

 

 

I stripped a large server room down a few years back and ended up with about 20 240v 4"pc (18w, 12w) fans and they are great (pc fans say there 4" but the fan blades are about 3" across) 

you can use a fan controller to reduce the noise and they slide in a square 1ltr pot so I can use 5"/6" ducting and use it as an extraction fan 

great for a small veg room or a box to dry the bud in, have the ducting going into the flower room so there no oder 

 

They be round fans in a square housing, lol...not really suitable for moving the volume of air nessesary from a tent/room...I have a 120mm one moving air around in my drying tent

 

ReplyQuote
Posted : October 15, 2020 9:11 am
jacks_farm
(@jacks_farm)
Linalool
100 Post Likes
250 Post Likes
500 Post Likes
1K Post Likes
2.5K Post Likes
Known Member
Points: 8501

@zn 

Thinking about it, they could be 120mm fans, used one in my old small veg cabnet 

with a few t5's 

They seem to do the job, got the idea from the old micro pc case grows

 

 

 

ReplyQuote
Posted : October 15, 2020 9:36 am
monkeydo liked

Our forum is free to join. We are an international cannabis forum that helps people all over the world grow their own personal supply of cannabis. Through our site you will find cannabis breeding forumscannabis deficiency forumsindoor cannabis growing forums, and much more. 

We are a home growers cannabis forum, and we only allow people who grow cannabis for personal use to be members. Our mission is to help you grow your own cannabis. We do not buy/sell/trade cannabis, or equipment for growing cannabis. Our site is strictly a cannabis smokers forumcannabis growers forum and forum for medical cannabis users.

Use our guides on how to growing cannabiscannabis grow dairies, and growers forum to find all the info you need to learn how to grow your own cannabis.

Any member who is suspected of growing cannabis for commercial gains will be banned immediately.

Please read our forum rules, and enjoy the site.

Find us on all social networks! Just search for Percys Grow Room