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  #51  
Old 08-11-2014, 06:29 AM
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Join Date: Feb 2011
Location: Slovakia
Posts: 64
Default Re: 42" in Hungary by Slovak guy ;)

hm.. dont think, coz
https://www.fornobravo.com/PDF/FB_blanket.pdf

"Each Forno Bravo oven comes with 50 sq. ft. of FB Blanket, enough to cover the oven with at least a 1" thick layer.

Mechanical
Size: 25’x24”x1”
Volume: 50 sq. ft.
Weight: 37.0 lbs.
Covers a 42” wood oven dome with one layer."

50 sq f is 4.64 sq m.

Locally it is
Cerablanket 1260C 25x610x7320 mm OH 130 kg/m3 (one package 4,47 m2) Price:14,55 EUR/m2

so in best you need 2 packages to cover it once
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  #52  
Old 08-11-2014, 06:58 AM
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Location: Norway
Posts: 82
Default Re: 42" in Hungary by Slovak guy ;)

Quote:
Originally Posted by alex.g View Post
hm.. dont think, coz
https://www.fornobravo.com/PDF/FB_blanket.pdf

"Each Forno Bravo oven comes with 50 sq. ft. of FB Blanket, enough to cover the oven with at least a 1" thick layer.

Mechanical
Size: 25x24x1
Volume: 50 sq. ft.
Weight: 37.0 lbs.
Covers a 42 wood oven dome with one layer."

50 sq f is 4.64 sq m.

Locally it is
Cerablanket 1260C 25x610x7320 mm OH 130 kg/m3 (one package 4,47 m2) Price:14,55 EUR/m2

so in best you need 2 packages to cover it once
Looks like I'll need some more...
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  #53  
Old 08-11-2014, 07:41 AM
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Default Re: 42" in Hungary by Slovak guy ;)

raw calculation of the surface area without entrance is - 8.5 m2
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  #54  
Old 08-12-2014, 01:03 AM
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Join Date: Feb 2011
Location: Slovakia
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Default Re: 42" in Hungary by Slovak guy ;)

it is already
Google formulae

Switch to m2 and you will see

Other problem is, ceramik blanket here is not a cheap thing, 5 rolls (~4.5 m2 each) of 25mm thickness (1 inch) would cost 300EUR
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  #55  
Old 08-12-2014, 03:42 AM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
Posts: 47
Default Re: 42" in Hungary by Slovak guy ;)

You can use this Wired Mat WM 640 GG | Knauf Insulation Technical Solutions it works well and I am shure you can get it in Hungary. Price 18 roll.
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  #56  
Old 08-12-2014, 04:52 AM
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Default Re: 42" in Hungary by Slovak guy ;)

Quote:
Originally Posted by alex.g View Post
it is already
Google formulae

Switch to m2 and you will see

Other problem is, ceramik blanket here is not a cheap thing, 5 rolls (~4.5 m2 each) of 25mm thickness (1 inch) would cost 300EUR
It costs even more here in Norway... hate to buy more if I don't have to.
This is how I've been thinking and I must be doing something wrong with my math

My 42 inch oven has a outside radius 58,5 cm. For the sake of keeping it simple
say r=59 cm. If I put that in the sphere calculator I get 4.37 m2.
Because its only half a sphere shouldn't we divide that number by 2 and get 2.19 m2.
I used this calculator
Sphere Calculator
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  #57  
Old 08-12-2014, 04:57 AM
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Default Re: 42" in Hungary by Slovak guy ;)

did you use it? How thick?
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  #58  
Old 08-12-2014, 05:03 AM
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Default Re: 42" in Hungary by Slovak guy ;)

you are right only >2 m2

Rock wool.. anyone tried it? Really cheaper and Lambda seems like on par
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  #59  
Old 08-12-2014, 05:13 AM
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Default Re: 42" in Hungary by Slovak guy ;)

Quote:
Originally Posted by alex.g View Post
you are right only >2 m2

Rock wool.. anyone tried it? Really cheaper and Lambda seems like on par
According to reps from Rockwool here in Norway, Rockwool contains a binder that disintegrates after repeated high temp heatings. Ceramic blankets do not use binders they are woven together. But I'm really not sure if its a problem with these ovens.
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  #60  
Old 08-12-2014, 05:36 AM
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Default Re: 42" in Hungary by Slovak guy ;)

Nobasil WM 660 GG here in Slovakia from Knauf is marked up to 660C
From what i read dome top can reach 1000F (537C)

trying to call there and find out of 660C is ok for onetime heat or it can reach 600 everytime with no damadge

Maybe then it is wise to cover 1 inch ceramic and then that rockwool?
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