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jjackstone

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Posts: 58
Reply with quote  #1 

As stated previously I am trying to build air heaters for a minimum dollar amount to give away to folks who want to save money on utility bills. Following is a list of terms I use to search for materials in the free section on Craigslist.

GLAZING

Glass

Window(s)

Door(s)

Shower

Slider(s)

Sliding

Refrigerator

Fridge

Twin wall

Polycarbonate

Tempered

Roofing

 

INSULATION

Foam

Styrofoam

Insulation

Polyiso

 

WOOD

Pallet(s)

Plywood

Fence

OSB

Particle

Wood

Lumber

Construction

1 x 6

2 x 4

AIR MOVERS

Hood

Fan(s)

Blower(s)

Exhaust

Range

Oven

Stove

Microwave

Vent

 

COLLECTOR MATERIAL

Screen(s)

 

 

MISCELLANEOUS

Paint

Screws

Flashing

RTV

Sealant

Duct

Ducting


 I have collected several tempered glass shower doors in the last week, a bunch of open cell foam although that may not be the best for these heaters, and a fair amount of 1 x 6 redwood fence slats. The slats are usually only five and a half to six feet long but for the price(free) they can easily be spiced together to make longer boards. Same thing with pallets. 

Please feel free to ask questions as to why I search for certain terms if it doesn't make sense to you. And If you have terms that I overlooked, please add to the list. Thanks.


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JJ

jjackstone

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Posts: 58
Reply with quote  #2 
While I knew that there was a way to search for multiple items at the same time, it took me a while to actually set up a search term that would do so. You have to use a single pipe between the terms to act as an "or" symbol. I'm sure some of you already knew that.

I broke the searches into a few long search terms as follows which I saved in a Word file and copy and paste to the CL search box.

Glass | Window | windows | Door | doors | Shower | sliding | tempered | polycarbonate | roofing

twinwall | fridge | refrigerator 

foam | Styrofoam | polyiso | insulation 

Hood | Fan | fans | Blower | Exhaust | Range | Oven | stove | Microwave | Vent 

Pallet | pallets | plywood | Fence | OSB | Particle | Wood | Lumber | Construction

Screen | screens

Paint | Screws | Flashing | RTV | Sealant | silicon | Duct | Ducting


Things I have discovered that cause problems. CL only likes one line at a time. I think it saw a carriage return and wouldn't search anything past that. It also doesn't like more than one word at a time. Ex: I searched for   twin wall | fridge | refrigerator  and got almost nothing back. But I knew there were a bunch of free fridges listed.
so I went back and tried twinwall | fridge | refrigerator  and the search functioned properly. Notice the missing space between the words twin and wall. Set the search parameters to newest and then you can just go down the list for the day and not have to search through dozens of previous posts too.

I've obtained a couple dual pane sliding patio doors(tempered glass) in the last week. There are more out there but I'm sitting on six sheets of glass already. Pallets are readily available in various shapes, sizes and condition. Other types of wood construction material pop up occasionally. Still the most scarce item seems to be polyiso insulation sheets. And the search continues.

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JJ
gbwillson

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Posts: 2,274
Reply with quote  #3 
JJ-

Like any search on the internet, the key is using the correct search context. I never knew you could search multiple items on CL, so thanks for the info. Do you know if there is a way to EXCLUDE items from a search? Some searches grab too much. Another possible place to seek out building materials is a local version of CL. Where I live it's called NextDoor. Lots of free stuff people are trying to get rid of. 

On a different note...Styrofoam should NOT be used in a heater as it can't handle the heat that can present itself if the unit stagnates or has poor circulation for even a short time. However, if you WERE to use styrofoam, a layer of ½" polyiso or more should be sufficient to keep the styrofoam safe. I sure would use it if it was free. Extra insulation is never a bad thing, especially if the heater unit is exposed to the winter winds. 


Greg in MN
jjackstone

Registered:
Posts: 58
Reply with quote  #4 
Here is the info directly from the CL site.

3. Narrowing Your Search

The following methods can be used to further narrow your search results:

  • Phrase Search: You can use quotation marks to search for a specific phrase. 

    e.g. this search finds postings with the exact phrase "coffee table" listed: "coffee table"
  • Exclude Terms: You can exclude a term by using the "-" symbol before the word you want excluded.

    e.g. this search finds postings that have the word 'table' but not 'coffee': table -coffee
  • "OR" Search: You can find postings with one or multiple terms by using the "|" symbol between words.

    e.g. this search finds postings that have 'honda' or 'toyota' (or both): honda | toyota
  • Grouping: You can group terms together in parenthesis when queries are complicated.

e.g. this search finds postings with 'honda' or 'toyota' (or both) but not 2000 or 2001(toyota | honda) -2000 -2001

  • Wildcards: You can search for different forms of a word by using the "*" symbol.

    e.g. din* table (matches "dining table," "dinner table")
    e.g. wood floo* (matches "wood floors," "wood flooring", etc)
    e.g. iphone* (matches "iphone," "iphones," "iphone5," etc)

I use Nextdoor locally also. Not nearly as much material to be found there in my location.

As for the styrofoam there are a couple things about that. First, I normally use it for other projects to create models of items to be built.
Second, I was wondering if you are talking about both closed cell and open cell styro or if it makes a difference. Or what is more commonly known as extruded and expanded. Extruded is the pink or blue stuff that is used for wall insulation. Expanded is normally white and is actually tons of little balls of styrofoam adhered together. My thought on either of them is that if I were to use them for collector insulation I would put them on the outside of the wood base of the collector. I did something similar last year with a sheet of aluminum foil between the  foam and the wood to reflect any heat back into the box. Had no problem there even on days I forgot to use the collector. Those temps would get up to around 185 F inside the collector. 

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JJ
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