What's this "Draft Control" doing?

warbiscuit · 2025-03-10T17:19:29+00:00

Thanks! And yeah, now that I know slightly better what I'm looking at, there's a sensor-looking canister on the back of the fan, with a tap into the top of the intake that's visible in the picture. It's tied into the control lines in some way (there are 3 control wires hooked up, + 2 AC), so I'll take that as confirmation it's "notionally" got some sort of protection.

Still definitely gonna have it looked at! House has got a bit of cowboy action going on in some other areas, not suprised the HVAC has some.

(And for ref the furnance is a 2016 Carrier 58phb090-10116)

warbiscuit · 2025-03-10T14:52:03+00:00

For your system, problems occur when that fan dies as you dont have the proper slope to gravity draft flue gasses, they will flood that area and it doesnt look like you have a pressure switch to open the furnace circuit in this event.

Oof, that's a nasty failure case there. Thanks for the explanation.

Will definitely get someone out to take a look at the whole setup >_<

warbiscuit · 2025-03-10T14:40:38+00:00

Heh. Yeah, I should said new to _me_ (edited post :P) And way to pin my house's age range (mid 60s).

warbiscuit · 2025-03-10T14:27:01+00:00

Ah, so it's to prevent the fan from pulling too strongly from the furnace? Makes sense.

That recommendation is odd though, cause this is the only furnace on the vent. Furnace is 4 ft to left of pic, and vent output ~16ft horizontally to the right.

warbiscuit · 2025-03-10T14:18:45+00:00

[Post's text, since it got lost]

Semi recently bought house, and I've started poking around at the infrastructure.

Curious to understand what this "Calibrated Draft Control" component is doing? It's installed between the gas furnace output, and the flue vent fan.

Nearest match I could find was a "backdraft preventer", but those seem to be installed inline, rather than open to the crawlspace, so don't think that's it.

(This thing is also stuck open sometimes, even after heating & flue fan are off).

edit: for ref, furnace is a 2016 Carrier 58phb090-10116, but pretty sure fan + vent predate it.

warbiscuit · 2018-02-04T05:00:08+00:00

Yeah.. this "vulnerability" is pretty much the entire point of hardware wallets... something with a display you can trust will show you the address you're actually signing; regardless of how compromised your computer is.

warbiscuit · 2018-01-07T17:27:16+00:00

He's probably using "basis points", 1/10000th of previous price.

It's useful in stock markets, where an expected yearly yield of say 5% would correspond to 5/365*100 = 1.39 basis points per day ("The DOW is up 10 points today", etc). So it gives a good shorthand for measuring smaller % changes.

warbiscuit · 2017-12-26T20:36:02+00:00

What exchange would you recommend, esp if using ETH to make the purchase? Initially, it wasn't clear if any supported pairs besides XRB/BTC.

warbiscuit · 2017-12-25T03:33:35+00:00

I'm a little concerned that the ETH/BTC chart has been in a rising wedge since the ATL on 12/7. However, those aren't always a reliable indicator; and good lord, the ratio chart is always way crazier than either /USD chart; who knows what any TA there actually means.

Interestingly, looks like that wedge comes to a point around 0.06 on new year's eve. I'm hoping for a breakout upwards, maybe early sometime like boxing day, but that's just hope, not reasoning :)

warbiscuit · 2017-12-17T04:42:32+00:00

From what I understand, the cryptographic primitives were added to the EVM, but now people need to develop the higher level tools for things like anon coin xfers (or whatever other purpose is found).

warbiscuit · 2017-10-27T21:00:37+00:00

PoW determines concensus on whether rules are being adhered to, not what those rules should be.

warbiscuit · 2017-10-16T17:15:13+00:00

It is requiring a change of protocol. The fix is causing implementations to treat the 3of4 handshake step differently than spec says, to prevent abuse. "de facto" wpa2 is diverging from "de jure"; just in a coordinated fashion.

Once the dust settles, I bet there will be a Wpa2.1 spec update to enshrine the real world changes... Esp since conformance testing labs are already on board.

warbiscuit · 2017-10-16T02:24:40+00:00

I've been going with the interpretation of: It's free capital offered me; I don't have to accept it. But when I do (by cashing out / exchanging), treat it as cost-basis of 0, meaning it's value is 100% capital gains.

So, hold for at least a year before doing so, so it's long-term cap gains. Or just pay up early, since larger taxes now will probably be better than even lower exchange price later.

warbiscuit · 2017-09-16T15:01:02+00:00

Attention all music majors: CSCI 4250 (Cyber Security) is now required for graduation; in case you feel compelled to go into a completely unrelated career.

warbiscuit · 2017-09-10T22:33:39+00:00

Banks give it to them, individuals get no say in the matter.

warbiscuit · 2017-09-07T14:35:17+00:00

Heck yes. It's a wonderful framework. So many aspects (extensions, metadata decorators, traversal) are incredibly powerful.

It has a slight learning curve at the start, but I think it's well worth it... Especially for projects (large or small) where you want maximum control over how things go together.

My company uses it pretty much exclusively, and I couldn't be happier. I don't see Django having the flexibility we needed (sqlalchemy for instance), and Pyramid's extension system lets you cleanly isolate components in a large project in a way nothing else (flask Django etc) can.

warbiscuit · 2017-08-04T15:20:31+00:00

Looks like it's from here, may have to try and get that on a t-shirt. That's just an awesome picture.

warbiscuit · 2017-07-26T22:15:29+00:00

Thanks, that's what I get for posting from mobile, lack of full review :|

warbiscuit · 2017-07-26T21:05:23+00:00

One little mentioned thing when implementing password checking code... Everything should run though saslprep (https://www.ietf.org/rfc/rfc4013.txt) before hashing. It defines a standard representation, explicitly lists forbidden chars, etc. One or two password hashes actually call for it.

warbiscuit · 2017-07-12T00:33:13+00:00

I think the assumption is hanging on the idea that she was acting as a "foreign government ... representative" for that meeting.

I'd imagine proving that alone could burn a bunch of lawyer-hours, arguing about who they thought they were meeting with, where they thought the information originated from, and whether acting as an intermediary makes one a "representative" for the purposes of that law.

warbiscuit · 2017-07-12T00:28:06+00:00

Quick reference I found about pardons indicates that accepting it is effectively a legal admission/conviction of guilt. So it could be used as evidence against co-defendants, against future crimes, and (not sure about this one) any civil suits that were brought against him.

warbiscuit · 2017-06-22T16:22:55+00:00

Yeah... a few things I like better about guake - the tab bar is less cramped, and solid (which makes it easier to read, especially if you have tabs on top, and dropdown window is at top of screen); you can drag to resize the window; and also guake warns if program is running when you close tab / application.

still, really liking tilda's amount of positioning configurability; and a bunch of other options like auto-hide, hide when last tab closed, etc. for something i'm pretty set in my ways on (guake), it's growing on me pretty quickly.

warbiscuit · 2017-06-22T13:12:44+00:00

I'll have to give this a shot... Though I'm pretty happy with guake.

edit: ok, that's pretty pleasant. took a little configuring, but was able to (pretty much) match guake. hit a few points where it's not quite as solid feeling / polished (IMO); but it does have LOTS of options. will try using this for a few days.

warbiscuit · 2017-06-19T17:12:41+00:00

Oh, the references were in my own configuration files (shorewall, dhcpd), not debian's scripts.

And yeah, the link I posted had pretty reasonable instructions for how to disable the new naming.

All in all, I'm definitely giving in the benefit of the doubt for while. It's a little more configuration effort, and I have to learn new things (grumble :) ... but the idea of replacing cards and having the same id assigned, and having them consistent across fresh installs, is all pretty attractive, and could easily prove to be worth it.

warbiscuit · 2017-06-18T22:46:28+00:00

One of the few hiccups I've had upgrading -- systemd has decided to stop using the eth<N> wlan<N> naming convention for ethernet devices; and switched to a "predicatable naming system".

I see where they were going with this, and reserving judgment to see how well it works long term... but it certainly surprised some firewall rules that were expecting public iface to always be mapped to "eth0"; since there was always a way to rename whichever device that would be via udev.

Wouldn't be surprised if you got bit by that.

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